Bovines on botox enjoy stuff (4)
I believe the answer is:
oxen
'bovines' is the definition.
(ox is a kind of bovine)
'on botox enjoy stuff' is the wordplay.
'stuff' indicates a hidden word (I've seen 'stuffing' mean this).
'OXEN' can be found hidden inside 'on botox enjoy'.
(Other definitions for oxen that I've seen before include "Steers" , "Domestic bovines" , "Bovine animals, in yoke" , "Draught animals" , "Domesticated bovines" .)