Musical instrument filled with ice cream? (6)

I believe the answer is:

cornet

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'musical instrument' is the definition.
(cornet is a kind of musical instrument)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for cornet that I've seen before include "play this?" , "I produce notes" , "Brass band instrument" , "Cone-shaped wafer" , "its contents cold" .)

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