Instruments are terribly sharp (5)

I believe the answer is:

harps

'instruments' is the definition.
(harp is a kind of instrument)

'terribly sharp' is the wordplay.
'terribly' indicates an anagram.
'sharp' is an anagram of 'HARPS'.

'are' is the link.

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

I've seen this clue in The Mirror.

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