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