Rapprochement
I think it could be either:
'rapprochement' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for entente that I've seen before include "friendly relations" , "Teen ten involved in friendly understanding between countries" , "Friendly arrangement" , "Informal alliance" , "Friendly agreement between states" .)
(Other definitions for detente that I've seen before include "Easing of international hostility" , "relaxation" , "peace during hostilities" , "Slackening of tension" , "Easing of hostilities" .)