Feral American horse (7)
I believe the answer is:
mustang
'feral american horse' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for mustang that I've seen before include "SW US wild horse" , "Wild horse of the West" , "Ford car, first produced in 1964" , "Wild or half-wild horse" , "Hardy wild horse of the American western plains" .)