After opening of shop, steal, pocketing a vegetable (7)
I believe the answer is:
spinach
'vegetable' is the definition.
(spinach is a kind of vegetable)
'after opening of shop steal pocketing a' is the wordplay.
'after' is a charade indicator (letters next to each other).
'opening of' suggests taking the first letters.
'steal' becomes 'pinch' (pinching is a kind of stealing).
'pocketing' indicates putting letters inside.
The first letter of 'shop' is 's'.
'pinch' enclosing 'a' is 'pinach'.
's' next to 'pinach' is 'SPINACH'.
(Other definitions for spinach that I've seen before include "Popeye's vegetable" , "Vegetable plant" , "Popeye the Sailor's favourite vegetable" , "Dark green vegetable" , "leaves on plate?" .)