Heavenly food for Rambo is a stew (8)
I believe the answer is:
ambrosia
'heavenly food' is the definition.
(ambrosia is the food of the greek gods)
'rambo is a stew' is the wordplay.
'stew' is an anagram indicator.
'rambo'+'is'+'a'='ramboisa'
'ramboisa' is an anagram of 'AMBROSIA'.
'for' acts as a link.
(Other definitions for ambrosia that I've seen before include "food from the deli?" , "I'm so Arab (anagram)" , "dish fit for the gods when cooked without salt" , "food for Olympians" , "Legendary food bringing immortality" .)