Boorish cry? (3)
I believe the answer is:
boo
'cry?' is the definition.
(I know that boo is a type of cry)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for boo that I've seen before include "Shout in disgust" , "I hated that!" , "Show displeasure orally" , "Sound made to show disapproval or contempt" , "Shout of dislike" .)