Cows and oxen (6)
I believe the answer is:
cattle
'cows and oxen' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for cattle that I've seen before include "feature of 21/23 [NATIVITY SCENE]" , "Livestock, kine" , "Where it naturally lies (Latin)" , "Oxen, cows, bulls etc" , "Farm livestock" .)