Battles to send back uncooked food (7)
I believe the answer is:
warfare
'battles' is the definition.
(fighting wars)
'send back uncooked food' is the wordplay.
'send back' says the letters should be written backwards.
'uncooked' becomes 'raw' (similar in meaning).
'food' becomes 'fare' (fare is a kind of food).
'raw' in reverse letter order is 'war'.
'war'+'fare'='WARFARE'
'to' acts as a link.
(Other definitions for warfare that I've seen before include "Armed contest" , "Armed conflict" , "Struggle" , "action" , "Combat" .)