Clarinet, oboe and saxophone (5)
I believe the answer is:
reeds
'clarinet oboe and saxophone' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for reeds that I've seen before include "Tall stiff marsh grasses" , "Music-makers" , "River grasses" , "Water plants" , "Tall slender grasses of wet areas" .)