Avian symbol of peace (4)
I believe the answer is:
dove
'avian symbol of peace' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for dove that I've seen before include "Mourning, collared, bird" , "plunged in the Grand Canyon" , "Bird; advocate of peace" , "Peacemaker" , "So-called pacifist" .)