Big brass instrument (4)

I believe the answer is:

tuba

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

This is all the clue.

(Other definitions for tuba that I've seen before include "Large low-pitched brass musical instrument" , "Brass band instrument" , "Large brass wind instrument" , "Player" , "Valved instrument" .)

I've seen this clue in the Universal and the USA Today.

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