Game goddess eviscerated Kallone's twin? (9)
I believe the answer is:
lookalike
'twin?' is the definition.
(twin can mean someone's double)
'game goddess eviscerated kallone's' is the wordplay.
'game' becomes 'loo' (historical card game).
'goddess' becomes 'kali' (I've seen this before).
'eviscerated' means to remove the middle letters (the word is disembowelled of its inside letters).
'kallone' with its centre removed is 'ke'.
'loo'+'kali'+'ke'='LOOKALIKE'
(Other definitions for lookalike that I've seen before include "twin?" , "Doppelganger" , "Double" , "Copy" .)