It could be guilty enjoyment — not certain (4)

I believe the answer is:

plea

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'it could be guilty enjoyment not certain' is the definition.
The definition suggests a singular noun which matches the answer.

This is all the clue.

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(Other definitions for plea that I've seen before include "Dispute" , "Petition or supplication" , "Defendant's answer to a charge or claim" , "(and 14) Enjoyment - gratification" , "Humble request for help" .)

I've seen this clue in The Times.

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