completely, totally
The site must be completely cleared and made safe for children.

partially
hastily, quickly
She hastily cleared a space for him to sit down.

away
Can you clear away all your toys now?

up
I want you to clear all this mess up.

from
They cleared the mud from the steps.

of
We cleared the path of leaves.

off
Clear those papers off the desk.

suddenly
His face suddenly cleared as understanding dawned.

try to
I went for a walk to try to clear my head.

help (to)
Correct breathing helps to clear the mind and reduce tension.

formally
The three defendants were formally cleared by the judge.

of
Four men accused of assault have been cleared of all charges.

be, seem
become
get sth, make sth
find sth

extremely, fairly, very, etc.
abundantly
absolutely, crystal, perfectly, quite
You have to make your intentions crystal clear to them.

by no means, not entirely, not exactly, not quite
It wasn't entirely clear whether she wanted us to help.

reasonably, relatively
painfully
increasingly

to
It was increasingly clear to us that there was a problem.

clear and concise

be

extremely, fairly, very, etc.
absolutely, quite

about
She was very clear about her reasons for leaving.

on
Are you clear on that point?

be, look
become, grow

extremely, fairly, very, etc.
The photograph wasn't very clear.

reasonably

loud and clear

be
become

extremely, fairly, very, etc.
The water was fairly clear.

absolutely, completely
reasonably

be, look, seem
remain, stay
keep sth
Make sure you keep all gutters and drainpipes clear of leaves.

completely
fairly, pretty, reasonably

of
The roads are reasonably clear of snow.

Clear is used with these nouns:
account, admission, advantage, advice, agenda, aim, air, allusion, alternative, answer, appreciation, association, assurance, benefit, bias, breach, brief, bulb, case, cause, chance, choice, commitment, communication, complexion, concept, conception, connection, conscience, consensus, contrast, contravention, correlation, definition, demonstration, description, determination, diagram, difference, direction, directive, distinction, division, dominance, echo, evidence, example, exception, expectation, explanation, expression, eye, favourite, focus, foul, gaze, glass, gloss, goal, guidance, guideline, handwriting, head, hint, honey, idea, illustration, image, implication, impression, incentive, indication, insight, instruction, lacquer, lake, law, lead, leadership, lesson, light, limit, link, liquid, loser, majority, mandate, manifestation, margin, meaning, memory, message, mind, morning, motive, nail polish, need, night, objective, opening, outline, parallel, patch, path, pattern, perception, photograph, picture, plastic, pointer, policy, precedent, preference, presentation, print, profit, proof, prose, reason, recognition, recollection, recommendation, reference, reflection, relationship, reluctance, road, role, rule, sense, separation, shot, sign, signal, similarity, skin, soprano, sound, soup, span, split, standard, statement, strategy, stream, summary, target, tendency, term, testimony, thinker, thinking, tone, trend, understanding, varnish, victor, victory, view, violation, visibility, vision, voice, warning, water, winner, word, wording, writing