Musical instrument or an ice cream holder (6)
I believe the answer is:
cornet
I believe this clue is a double definition.
'musical instrument' is the first definition.
(cornet is a kind of musical instrument)
'an ice cream holder' is the second definition.
(I've seen this before)
'or' is the link.
(Other definitions for cornet that I've seen before include "Trumpet-like instrument" , "Brass band instrument" , "Ice-cream cone" , "its contents cold" , "I produce notes" .)