Crossword Genius

508 (roughly) reject play on words? Relax! (7,2)

Ross

I believe the answer is:

lighten up

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'relax' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

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(Other definitions for lighten up that I've seen before include "Unwind" , "Chill" , "Relax!" , "Plug in the fire" .)

I've seen this clue in The Guardian.
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