Tent in river for international warmth (7)
I believe the answer is:
detente
'international warmth' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'tent in river' is the wordplay.
'in' is an insertion indicator.
'river' becomes 'Dee' (River Dee).
'tent' placed into 'dee' is 'DETENTE'.
'for' is the link.
Can you help me to learn more?
(Other definitions for detente that I've seen before include "peace during hostilities" , "Easing of strained relationships between countries" , "Easing of hostility between countries" , "Easing of international hostility" , "Easing of international tension" .)