Made a sound like a horse (7)
I believe the answer is:
neighed
'made a sound like a horse' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for neighed that I've seen before include "Heeding (anag)" , "Made a sound like a horse" , "Whinnied" , "sounded "horsey"" , "Cried" .)