Pile of green apples? (3)
I believe the answer is:
nap
'pile' is the definition.
(both can refer to the surface of a fabric)
'of green apples?' is the wordplay.
'of' indicates the answer is hidden within the clue.
'NAP' is hidden within 'green apples'.
(Other definitions for nap that I've seen before include "Racing tip that professes to be a certainty" , "Card game - quick sleep" , "Racing tip that claims to be a certainty" , "A brief informal sleep" , "A brief snooze" .)