Conflict over uncooked food (7)
I believe the answer is:
warfare
'conflict' is the definition.
(warfare is engagement in war)
'over uncooked food' is the wordplay.
'over' says the letters should be written backwards.
'uncooked' becomes 'raw' (similar in meaning).
'food' becomes 'fare' (fare is a kind of food).
'raw' back-to-front is 'war'.
'war'+'fare'='WARFARE'
(Other definitions for warfare that I've seen before include "Combat" , "Strife" , "Armed contest" , "action" , "Scraps, too, by the look of it" .)