String instrument (5)
(Other definitions for sitar that I've seen before include "Hindu stringed instrument" , "Indian string instrument" , "Plucked instrument" , "Stringed instrument of the subcontinent" , "Astir with Indian long-necked lute" .)
'string instrument' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for cello that I've seen before include "Bass stringed instrument" , "10 [INSTRUMENT]" , "Jacqueline du Pre's instrument" , "Large stringed instrument" , "has strings attached" .)
'string instrument' is the definition.
(I know that harp is a type of plucked string instrument)
This is all the clue.
(Other definitions for harp that I've seen before include "Lyre" , "David's instrument" , "semitone higher, abandoning intro" , "Instrument for angel" , "Chordophone" .)