He was in front of the line on the 'Abbey Road' album cover (6)

I believe the answer is:

lennon

(Other definitions for lennon that I've seen before include "John __; Beatles founder" , "John - (Imagine)" , "See 25" , "John . . . . . ., murdered Beatle" , "Beatle airport" .)

I've seen this clue in The Washington Post.

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