Young bovine (4)
I believe the answer is:
calf
'young bovine' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for calf that I've seen before include "Young seal" , "Roo's mum (A. A. Milne)" , "Young elephant" , "Young of domestic cattle" , "Part of the leg - baby farm animal" .)