Farm youngster (8)
I believe the answer is:
yearling
'farm youngster' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for yearling that I've seen before include "Youngster" , "Young racehorse" , "A racehorse under 2" , "Animal in its second 12 months" , "Animal in its second year" .)