Instrument that’s for holding ice cream (6)
I believe the answer is:
cornet
I believe this clue is a double definition.
'instrument' is the first definition.
(cornet is a kind of instrument)
'that's for holding ice cream' is the second definition.
(cornet is a type of ice cream cone)
(Other definitions for cornet that I've seen before include "I produce notes" , "Small trumpet or ice-cream holder" , "Musical instrument - ice cream" , "Ice cream cone" , "Ice-cream - brass instrument" .)