Mean to consume mostly raw fish (8)
I believe the answer is:
stingray
'fish' is the definition.
(type of fish)
'mean to consume mostly raw' is the wordplay.
'mean' becomes 'stingy' (both can mean miserly).
'to consume' is an insertion indicator.
'mostly' means to remove the last letter (most but not all of the word).
'raw' with its last letter taken off is 'ra'.
'stingy' going around 'ra' is 'STINGRAY'.
(Other definitions for stingray that I've seen before include "TV show" , "Dangerous fish" , "Fish with venomous tail" , "Marine creature with venomous tail" , "Poisonous spined fish" .)