Brass band instrument (9)

I think it could be either:

Which length description are you looking for?:

euphonium

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

This is the entire clue.

(Other definitions for euphonium that I've seen before include "brass piece" , "Bass-tenor tuba" , "Brass band instrument" , "Band member" , "Tuba-like instrument" .)

I've seen this clue in The Guardian.

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