Inclined to steal gin, the girl fed appallingly (5-8)
I believe the answer is:
light-fingered
'inclined to steal' is the definition.
(I've seen this before)
'gin the girl fed appallingly' is the wordplay.
'appallingly' is an anagram indicator (I've seen this in other clues).
'gin'+'the'+'girl'+'fed'='ginthegirlfed'
'ginthegirlfed' is an anagram of 'LIGHT-FINGERED'.
(Other definitions for light-fingered that I've seen before include "Like a pickpocket" , "Liable to steal" , "Inclined to steal" , "Adept at thieving" , "Likely to steal" .)