Word before horse or cow (3)
I believe the answer is:
sea
'word before horse or cow' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sea that I've seen before include "Great expanse of water" , "& 14 Ozone" , "North for one" , "E.g Aral or Weddell" , "Marine" .)