Fess up (5)

I think it could be either:

Which length description are you looking for?:

admit

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

This is the entire clue.

(Other definitions for admit that I've seen before include "Recognise" , "Profess" , "Agree to the truth" , "Stop being obstructive" , "Reveal" .)

I've seen this clue in the Penny Press, The Guardian and the King Feature Syndicate.

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