Stolen by gang, oven hot! (8)
I believe the answer is:
roasting
'hot' is the definition.
(thesaurus)
'stolen by gang oven' is the wordplay.
'stolen by' is an insertion indicator.
'gang' becomes 'ring' (synonyms).
'oven' becomes 'oast' (type of kiln).
'ring' enclosing 'oast' is 'ROASTING'.
(Other definitions for roasting that I've seen before include "Criticising" , "lecture" , "Cooking in fat" , "Organist (anag)" , "Lots of criticism" .)