Farfalle grocer hides quickly (7)
I believe the answer is:
allegro
'quickly' is the definition.
(I've seen this before)
'farfalle grocer hides' is the wordplay.
'hides' says the answer is hidden in the clue.
'ALLEGRO' can be found hidden inside 'farfalle grocer'.
(Other definitions for allegro that I've seen before include "quickly found in bars?" , "Austin" , "Fast (mus.)" , "Brisk movement or passage" , "In rapid tempo" .)