Coleridge's "Poor little foal of an oppressed race" (3)
I believe the answer is:
ass
'coleridge's poor little foal of an oppressed race' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ass that I've seen before include "Pompous person" , "Dipstick" , "Horse hybrid" , "'The law is a - - - a idiot' (Mr Bumble)" , "Animal related to horses" .)