Ollie's pal (4)
I believe the answer is:
stan
'ollie's pal' 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 "Laurel and Hardy, . . . . and Ollie" , "One of the comic duo" , "- Getz, jazz musician" , "Eminem hit; man's name" , "- Laurel, comedian" .)