Earth visitors (6)

I believe the answer is:

aliens

(Other definitions for aliens that I've seen before include "Creatures from another planet" , "Foreigners or creatures from outer space" , "Forms of life assumed to exist outside Earth" , "Science-fiction creatures" , "Strangers, extraterrestrials" .)

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

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.