Farm animal left to find cover (4)
I believe the answer is:
cowl
'cover' is the definition.
(I've seen this before)
'farm animal left' is the wordplay.
'farm animal' becomes 'cow' (I've seen this before**).
'left' becomes 'l' (common abbreviation).
'cow'+'l'='COWL'
'to find' is the link.
(Other definitions for cowl that I've seen before include "Monk's hood or chimney covering" , "form of protection?" , "Monk's hood - chimney cover" , "Hood-shaped covering" , "Dried fruit" .)