I hum one jazzily, interrupted by top instrument (9)

I believe the answer is:

euphonium

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'instrument' is the definition.
(I know that euphonium is a type of bass)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for euphonium that I've seen before include "brass piece" , "Wind instrument" , "Band member" , "Tuba-like instrument" , "Producer of notes" .)

I've seen this clue in The Independent.

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