Plow-pulling team (4)
I believe the answer is:
oxen
'plow-pulling team' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for oxen that I've seen before include "Cows and bulls" , "Bovine mammals" , "Large bovine animals" , "Bovine animals, in yoke" , "strong animals" .)