Plow-pulling pair (4)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
oxen
'plow-pulling pair' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for oxen that I've seen before include "Beasts of burden or domestic cattle" , "Horned farm animals" , "Lowers" , "Neat types" , "Bovine creatures" .)