Crossword Genius

Buff host with no clothing is what could alarm Sky viewer (4)

Ross

I believe the answer is:

ufos

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If this is the answer, I'm afraid I cannot explain it.

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(Other definitions for ufos that I've seen before include "Strange aerial objects" , "Potential alien craft" , "Mysterious objects in sky" , "Supposed spaceships" , "Roswell sightings?" .)

I've seen this clue in The Guardian.
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