Baseballer Musial (4)
I believe the answer is:
stan
'baseballer musial' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for stan that I've seen before include "guy" , "Eminem hit; man's name" , "Ollie's partner" , "Laurel and Hardy, . . . . and Ollie" , "- Laurel, comedian" .)