Sage is given greeting after end of war (5)
I believe the answer is:
rishi
'sage' is the definition.
(term for a Hindu sage)
'is given greeting after end of war' is the wordplay.
'given' says to put letters next to each other.
'greeting' becomes 'hi' (hi is a kind of greeting).
'after' means one lot of letters go next to another.
'end of war' becomes 'r' (I've seen this in other clues).
'is' next to 'hi' is 'ishi'.
'ishi' after 'r' is 'RISHI'.
(Other definitions for rishi that I've seen before include "Poet" , "Guru" , "wise man" , "Revered man" , "holy man" .)