Crossword Genius

Unidentified aircraft (4)

Ross

I believe the answer is:

ufos

(Other definitions for ufos that I've seen before include "Initially, official flying saucers" , "Supposed alien craft" , "Initially, formal flying saucers" , "Mysterious objects in sky" , "Supposed spaceships" .)

I've seen this clue in the Sydney Morning Herald.
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