Element of an orchestra (5)
(Other definitions for cello that I've seen before include "10 [INSTRUMENT]" , "Played by Rostropovich" , "Music-maker" , "Jacqueline du Pre's instrument" , "big fiddle?" .)
(Other definitions for bassoon that I've seen before include "Double-reed instrument" , "So-so ban on the instruments" , "Hollow instrument" , "Tenor of the oboe family" , "It is played" .)