Pouch in a garment (6)
I believe the answer is:
'pouch in a garment' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for pocket that I've seen before include "Snooker table feature" , "financial resources" , "Small isolated group" , "A ball-catching pouch on a snooker table" , "Snooker table hole" .)