Crossword Genius

Vehicles that might be beamers? (4)

Ross

I believe the answer is:

ufos

(Other definitions for ufos that I've seen before include "Potential alien craft" , "Initially, formal flying saucers" , "Supposed alien craft" , "Unauthorised traffic from outer space?" , "Mysterious things" .)

I've seen this clue in The Wall Street Journal.
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