General who arranged truces (6)
I believe the answer is:
custer
'general' is the definition.
(I've seen this before)
'arranged truces' is the wordplay.
'arranged' indicates anagramming the letters (letters rearranged).
'truces' is an anagram of 'CUSTER'.
'who' is the link.
(Other definitions for custer that I've seen before include "General who died at battle of Little Bighorn" , "US general killed by Indians in eighteen-seventy-six" , "General who was killed at the battle of Little Bighorn" , "General killed by Sioux" , "General ......, massacred at Little Big Horn" .)