Sharp instruments? (5)

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harps

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'sharp instruments?' is the definition.
'harps' can be an answer for 'instruments?' (I've seen this in another clue). I'm unsure of the 'sharp' bit.

This is all the clue.

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

I've seen this clue in the Evening Standard.

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