Musical instrument filled with ice cream? (6)

I believe the answer is:

cornet

I'm a little stuck... Click here to teach me more about this clue!

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

I cannot understand how the remainder 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" .)

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.