Musical instrument, one carried by celebrity (5)
I believe the answer is:
sitar
'musical instrument' is the definition.
'sitar' can be an answer for 'instrument' (sitar is a kind of instrument). I also know that 'musical' relates to this answer.
'one carried by celebrity' is the wordplay.
'one' becomes 'i' (Roman numeral).
'carried by' is an insertion indicator.
'celebrity' becomes 'star' (I've seen this before).
'i' going into 'star' is 'SITAR'.
(Other definitions for sitar that I've seen before include "Long-necked musical instrument of India" , "Stringed instrument of the subcontinent" , "Hindu stringed instrument" , "Long necked and often plucked" , "Indian string instrument" .)