Horse’s cry (6)
I believe the answer is:
whinny
'horse's cry' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for whinny that I've seen before include "Horse's cry" , "High-pitched neigh" , "Joyful neigh of a horse" , "animal noise?" , "Gentle or joyful neigh" .)