Trumpet-like instrument (6)
I believe the answer is:
cornet
'trumpet-like instrument' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for cornet that I've seen before include "Musical instrument - ice cream" , "Trumpet-like instrument" , "Kind of trumpet or ice-cream holder" , "It's blown" , "Musical instrument like small trumpet" .)