Animal of the horse family (3)

I believe the answer is:

ass

(Other definitions for ass that I've seen before include "Trump's behind" , "An American backside" , "Quadruped; fool" , "'The law is a - - - a idiot' (Mr Bumble)" , "Blockhead" .)

I've seen this clue in the Irish Times (Simplex) and The Irish Times.

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