Crossword Genius

Heard old-fashioned instruments (5)

Ross

I believe the answer is:

corni

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'instruments' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for corni that I've seen before include "instruments" , "Brass" .)

I've seen this clue in The Sunday Times and The Times.
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