Sausage and cool drink passed round volunteers (9)
I believe the answer is:
'sausage' is the definition.
(I know that chipolata is a type of sausage)
'cool drink passed round volunteers' is the wordplay.
'cool' becomes 'hip' (hip can mean cool or fashionable).
'drink' becomes 'cola' (cola is a type of drink).
'passed round' indicates putting letters inside.
'volunteers' becomes 'TA' (abbreviation for Territorial Army).
'hip' going into 'cola' is 'chipola'.
'and' is the link.
(Other definitions for chipolata that I've seen before include "Small thin sausage" , "Type of sausage" , "banger" , "Party snack" .)