Hall of Famer Musial (4)
I believe the answer is:
stan
'hall of famer musial' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for stan that I've seen before include "guy" , "- Getz, jazz musician" , "One of the comic duo" , "- Laurel, comedian" , "Laurel perhaps" .)