Deer and cow noises echo (5)
I believe the answer is:
moose
'deer' is the definition.
(moose is a kind of deer)
'cow noises echo' is the wordplay.
'cow noises' becomes 'moos'.
'echo' becomes 'e' (phonetic alphabet: alpha, bravo, charlie etc.).
'moos'+'e'='MOOSE'
'and' is the link.
(Other definitions for moose that I've seen before include "Large N American deer like European elk" , "Animal" , "North American deer" , "US deer with enormous antlers" , "Large northern deer" .)