Volunteers, smart, needed for sampling wine? (7)
I believe the answer is:
tasting
'sampling wine?' is the definition.
(tasting wine)
'volunteers smart needed' is the wordplay.
'volunteers' becomes 'TA' (abbreviation for Territorial Army).
'smart' becomes 'sting' (both can mean to burn or hurt).
'needed' is a charade indicator (letters next to each other).
'ta'+'sting'='TASTING'
'for' is the link.
(Other definitions for tasting that I've seen before include "Sampling (food)" , "event with wine" , "Savouring" .)