Their notes can be sharp (5)

I believe the answer is:

harps

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'their notes' is the definition.
I can't tell whether this defines the answer.

'can be sharp' is the wordplay.
'can be' is an anagram indicator.
'sharp' anagrammed gives 'HARPS'.

Can you help me to learn more?

(Other definitions for harps that I've seen before include "Dwells" , "Musical instruments of sharp kind" .)

I've seen this clue in the Evening Standard.

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