Crossword Genius

Boorish cry? (3)

Ross

I believe the answer is:

boo

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'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" .)

I've seen this clue in the Evening Standard.
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