Crossword Genius

Mind-blowing where UFOs come from? (3,2,4,5)

Ross

I believe the answer is:

out of this world

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If this is the answer I cannot explain how the clue works.

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(Other definitions for out of this world that I've seen before include "Astronauts are sometimes" , "fantastic" , "setting for space opera" , "Delightful" , "astronauts fired here" .)

I've seen this clue in The Telegraph.
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