Zest returns after small nap (5)

I believe the answer is:

sleep

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'nap' is the definition.
(synonyms)

I can't explain the rest of the clue.

(Other definitions for sleep that I've seen before include "Wayne _; former Royal Ballet principal dancer" , "Be dormant" , "Shut-eye" , "crash" , "''... that knits up the ravell'd sleeve of care'' (Macbeth)" .)

I've seen this clue in The Times.

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