Crossword Genius

Guitarist's fantastic writing harmonies without me (8)

Ross

I believe the answer is:

harrison

'guitarist's' is the definition.
(George Harrison, guitarist with The Beatles)

I don't understand the rest of the clue.

(Other definitions for harrison that I've seen before include "George maybe" , "Guitarist, George - actor, Rex" , "-- Birtwistle, composer" , "Member of group" , "Ford possibly" .)

I've seen this clue in The Guardian.
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