Shankar's instrument (5)
I believe the answer is:
sitar
'shankar's instrument' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sitar that I've seen before include "music-maker" , "Long-necked musical instrument of India" , "Stringed instrument of the subcontinent" , "Indian string instrument" , "Plucked instrument" .)