Bring down cow? (5)
I believe the answer is:
lower
I believe this clue is a double definition.
'bring down' is the first definition.
(I know that bring down can be written as lower)
'cow?' is the second definition.
(I know that cattle can be written as lower)
(Other definitions for lower that I've seen before include "Let down, being inferior" , "Hereford, say" , "Threaten" , "Less high in place or position" , "subordinate" .)