Oboes and bassoons (5)
I believe the answer is:
reeds
'oboes and bassoons' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for reeds that I've seen before include "Long grasses" , "They vibrate to produce the sound of various musical instruments" , "Woodwind instruments" , "Waterside plants" , "Thatching stalks" .)