String of notes we hear (4)

I believe the answer is:

cord

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'string' is the definition.
(I've seen this in other clues)

I can't explain the rest of the clue.

(Other definitions for cord that I've seen before include "Line of twisted fibres or threads" , "A measure of cut wood" , "Thin rope" , "Thin string" , "Small rope or thick string" .)

I've seen this clue in The Irish News.

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