Sound sheepish (3)
I believe the answer is:
baa
'sound' is the definition.
(baa is a kind of sound)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for baa that I've seen before include "Sound from a ewe" , "Cry of a sheep" , "Bleat of a sheep" , "Statement from those flocking" , "How one of the fold may sound" .)