Sleep is a solid recommendation (3)

I believe the answer is:

nap

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

I can't explain the rest of the clue.

(Other definitions for nap that I've seen before include "Raised fibres on surface of cloth or leather" , "Short sleep on fuzzy fabric surface" , "Racing tip that claims to be a certainty" , "A fuzzy surface texture" , "Pile of material" .)

I've seen this clue in The Independent.

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