Can you play it in your sleep? (3)

I believe the answer is:

nap

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'sleep?' is the definition.
(a nap is a short sleep)

I don't understand the remainder of the clue.

(Other definitions for nap that I've seen before include "Short raised fibres on cloth on snooker table" , "Sleep lightly" , "A brief sleep, forty winks" , "A short day-sleep" , "Raised fibres on surface of cloth or leather" .)

I've seen this clue in the Evening Standard.

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