Former conflict, not quite cold, not quite warm (3,3)
I believe the answer is:
cod war
'former conflict' is the definition.
'cod war' can be an answer for 'conflict' (I have seen 'maritime conflict' mean 'cod war' so perhaps 'conflict' could also mean 'cod war'). I'm not sure about the 'former' bit.
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for cod war that I've seen before include "Net disagreement" , "maritime conflict" , "rows once around Iceland" , "fishing dispute" , "Conflict over the water" .)