Somewhat boorish cry? (3)
I believe the answer is:
boo
'cry?' is the definition.
(I know that boo is a type of cry)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for boo that I've seen before include "Exclamation of disapproval" , "Catcall" , "Cry of disapproval as at villain" , "Shout of dislike" , "I don't like that!" .)