Musician cut in bits, swallowed by bird (9)
I believe the answer is:
conductor
'musician' is the definition.
(conductor is a kind of musician)
'cut in bits swallowed by bird' is the wordplay.
'in bits' indicates an anagram (the bits of the anagram are rearranged).
'swallowed by' is an insertion indicator.
'bird' becomes 'condor' (condor is a kind of bird).
'cut' is an anagram of 'uct'.
'uct' going into 'condor' is 'CONDUCTOR'.
(Other definitions for conductor that I've seen before include "Copper is a good one" , "See 6" , "Director of an orchestra" , "Director - band leader" , "leader of the orchestra" .)