Like sheep (5)
I believe the answer is:
ovine
'like sheep' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ovine that I've seen before include "Pertaining to sheep" , "like a mug" , "Sheep-like" , "Like the Cheviots" , "1/6 = 2/3 of 28 [SHEEPISH" .)