Collocations for clause - noun

confidentiality, indemnity, penalty
The penalty clause specifies that late delivery will be fined.

escape, exclusion, exemption, get-out, let-out, opt-out
grandfather (= allowing an old rule to continue to apply in some situations), sunset (= ending a law after a particular date)

contain, have
The contract contains a confidentiality clause.

add, include, insert, put in
We added an opt-out clause to the agreement.

delete, take out
amend
violate (esp. AmE)
invoke

in a/the clause
There is some ambiguity in this clause.

under a/the clause
Under Clause 5.8, the company is responsible for the health of its employees.

clause on
a clause on pollution

main, subordinate
conditional, dependent, finite, independent, infinitive, non-finite, relative
non-restrictive, restrictive
a restrictive relative clause

adverbial, nominal, noun

in a/the clause
The completed action is in the main clause.