Gosh, a French horn! (3)

I believe the answer is:

cor

I believe this is a double definition.

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

'a french horn' is the second definition.

(Other definitions for cor that I've seen before include "Surprised expression" , "Gosh" , "Blimey" , "Expression of surprise" .)

I've seen this clue in the Evening Standard.

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