Examination requiring much bookwork? (5)

I believe the answer is:

audit

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'examination' is the definition.
(I know that audit is a type of examination)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for audit that I've seen before include "Formally examine" , "Inspection of records" , "review of books" , "HMRC inspection" , "Stocktake" .)

I've seen this clue in The Sun.

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