Actively oppose taking fifth examination (5)

I believe the answer is:

resit

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'examination' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for resit that I've seen before include "later exam" , "Repeat (an exam)" , "second exam" , "Enquiring intrusively (into person's affairs)" , "second try at test" .)

I've seen this clue in The Sunday Times and The Times.

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