Deep brass instrument (4)

I believe the answer is:

tuba

'deep brass instrument' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for tuba that I've seen before include "Lowest brass wind instrument" , "Valved instrument" , "horn" , "One's blown" , "Deep brass instrument" .)

I've seen this clue in The New York Times.

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