Cartoon spinach eater (6)
I believe the answer is:
popeye
'cartoon spinach eater' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for popeye that I've seen before include "Spinach-eating cartoon character" , "Spinach and Olive Oyl lover" , "Bluto's rival" , "Old cartoon sailor" , "Spinach-eating sailor" .)