Double-reed instrument (4)
I believe the answer is:
oboe
'double-reed instrument' is the definition.
(oboe is a kind of double-reed instrument)
This is all the clue.
(Other definitions for oboe that I've seen before include "Woodwind instrument of treble pitch" , "Walk with exaggerated movements" , "bit of wind" , "Instrument used in 1d" , "Double-reed wind instrument" .)