Crossword Genius

"Life is very short and there's no time / For fussing and fighting my friend” (____, The Beatles) (2,3,4,2,3)

Ross

I believe the answer is:

we can work it out

(Other definitions for we can work it out that I've seen before include "determined solvers?" , "A number" .)

I've seen this clue in The Times.
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