Bring down cow? (5)
I believe the answer is:
lower
I believe this clue is a double definition.
'bring down' is the first definition.
(synonyms)
'cow?' is the second definition.
(an animal which moos or lows)
(Other definitions for lower that I've seen before include "Let down, being inferior" , "Hereford, say" , "Threaten" , "Less high in place or position" , "subordinate" .)