Sam of Sam's Club (6)
I believe the answer is:
walton
'sam of sam's club' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for walton that I've seen before include "Izaak, angler: William, composer" , "English writer, d. 1683 - English composer. d. 1983" , "He composed" , "William --, composer (Belshazzar's Feast)" , "William ---, composer; Izaak ---, author" .)