U.F.O. crew (6)

I think it could be either:

Which length description are you looking for?:

aliens

'ufo crew' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for aliens that I've seen before include "Outsiders" , "Extra-terrestrial beings" , "'Little green men'?" , "Strangers, extraterrestrials" , "Strange forms of life" .)

I've seen this clue in the King Feature Syndicate, The New York Times and The Wall Street Journal.

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