Crossword Genius

A note of asperity (5)

Ross

I believe the answer is:

sharp

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'a note' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for sharp that I've seen before include "Hurtful" , "Acute - very keen" , "Cutting; acidic" , "Acidic; pointed" , "Unscrupulous character" .)

I've seen this clue in The Globe and Mail.
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