Relaxes after initial conflict ends (6)
I believe the answer is:
ceases
'ends' is the definition.
('cease' can be a synonym of 'end')
'relaxes after initial conflict' is the wordplay.
'relaxes' becomes 'eases' (I've seen this before).
'after' is a charade indicator (letters next to each other).
'initial' says to take the initial letters.
The first letter of 'conflict' is 'c'.
'eases' after 'c' is 'CEASES'.
(Other definitions for ceases that I've seen before include "Terminates" , "Stops or discontinues" , "Finishes" , "Comes to an end" , "stops working" .)