Bos indicus or a little prize bull? (4)
I believe the answer is:
zebu
'bos indicus' is the definition.
(zebu is a kind of bos indicus)
'a little prize bull?' is the wordplay.
'a little' says the answer is hidden in the clue (a little bit of the clue).
'ZEBU' is hidden in the letters of 'prize bull'.
'or' is the link.
(Other definitions for zebu that I've seen before include "Asian ox" , "ox penned" , "Type of ox" , "cattle" , "Bovine animal" .)