Clarinetist Artie (4)
I believe the answer is:
shaw
'clarinetist artie' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for shaw that I've seen before include "G. B. ---; T. E. ---" , "Major Barbara playwright" , "Irish author" , "Man and Superman playwright" , "writer of plays and critical commentaries" .)