"The Compleat Angler" author (6)
I believe the answer is:
walton
(Other definitions for walton that I've seen before include "He composed" , "William ---, composer; Izaak ---, author" , "Izaak, angler: William, composer" , "Sir William -, composer" , "Izaac . . . . . ., author of 'The Compleat Angler'" .)