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Small instrument basically emitting resonance of a higher frequency (7)

Ross

I believe the answer is:

sharper

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'a higher frequency' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'small instrument basically emitting resonance' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'instrument' becomes 'harp' (harp is a kind of instrument).
'basically' indicates taking the first letters (the first letter could be its root or base).
The initial letters of 'emitting resonance' is 'er'.
's'+'harp'+'er'='SHARPER'

'of' is the link.

Can you help me to learn more?

(Other definitions for sharper that I've seen before include "Card player" , "More acute" , "More acerbic" , "showing greater astuteness" , "Swindler (at cards)" .)

I've seen this clue in The Hindu.
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