He loves to eat more — gut is wobbling (7)
I believe the answer is:
gourmet
'he loves to eat' is the definition.
'more gut is wobbling' is the wordplay.
'is wobbling' indicates anagramming the letters.
'more'+'gut'='moregut'
'moregut' is an anagram of 'GOURMET'.
(Other definitions for gourmet that I've seen before include "Gastronome" , "One devoted to the refined enjoyment of food and drink" , "Connoisseur of good food and drink" , "Connoisseur of fine food" , "Discriminating eater" .)