Group pleased to accept free gin (10)
I believe the answer is:
contingent
'group' is the definition.
(contingent is a kind of group)
'pleased to accept free gin' is the wordplay.
'pleased' becomes 'content' ('content' is associated in meaning with 'pleased').
'to accept' is an insertion indicator.
'free' indicates an anagram.
'gin' anagrammed gives 'ing'.
'content' enclosing 'ing' is 'CONTINGENT'.
(Other definitions for contingent that I've seen before include "Some soldiers" , "Company" , "Dependent on something else" , "Quota of troops" , "uncertain" .)