Crossword Genius

That's all there is to it; it's that simple! (4,4,5)

Ross

I believe the answer is:

bobs your uncle

(Other definitions for bobs your uncle that I've seen before include "Rob one of the family?" , "Everything's OK" , "Simple!" , "Everything will be OK" , "No problem" .)

I've seen this clue in The Guardian.
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