Intoxicating prison gang (8)
I believe the answer is:
stirring
'intoxicating' is the definition.
(thesaurus)
'prison gang' is the wordplay.
'prison' becomes 'stir' (informal term for prison).
'gang' becomes 'ring' (synonyms).
'stir'+'ring'='STIRRING'
(Other definitions for stirring that I've seen before include "Rousing (using a spoon?)" , "Agitating or rousing" , "Exciting" , "Agitating a liquid" , "causing trouble" .)