ET (5)

I think it could be either:

Which length description are you looking for?:

alien

'et' is the definition.
(short for extra-terrestrial)

This is the entire clue.

(Other definitions for alien that I've seen before include "Creature from another planet" , "ET" , "Someone from outer space?" , "Stranger" , "Martian, say" .)

I've seen this clue in The Telegraph, the New York Times and The Guardian.

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