Martians, eg (6)

I think it could be either:

Which length description are you looking for?:

aliens

(Other definitions for aliens that I've seen before include "Outsiders" , "Forms of life assumed to exist outside Earth" , "'Little green men'?" , "Beings from another planet" , "Life-forms assumed to exist beyond Earth" .)

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

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