Smooth musician producing flyer (9)
I believe the answer is:
sandpiper
'flyer' is the definition.
(type of bird - something which flies)
'smooth musician' is the wordplay.
'smooth' becomes 'sand' (sanding is a kind of smoothing).
'musician' becomes 'piper' (piper is a kind of musician).
'sand'+'piper'='SANDPIPER'
'producing' is the link.
(Other definitions for sandpiper that I've seen before include "Ground-dwelling wading bird" , "Shore bird" , "knot" , "winger" , "Stint" .)