Instrument from bedsit arrives (5)
I believe the answer is:
sitar
'instrument' is the definition.
(sitar is a kind of instrument)
'from bedsit arrives' is the wordplay.
'from' says the answer is hidden in the clue.
'SITAR' is hidden within 'bedsit arrives'.
(Other definitions for sitar that I've seen before include "Lasting from morning to night" , "music-maker" , "Large Indian lute" , "Long-necked musical instrument of India" , "music producer" .)