Unknown person (8)

I believe the answer is:

stranger

'unknown person' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for stranger that I've seen before include "More curious or unfamiliar" , "One who is little known" , "Alien; odder" , "visitor" , "Truth can be ... than fiction" .)

I've seen this clue in the Newsday.com, The Star Tribune, the King Feature Syndicate, the USA Today, the Universal, The Times, The Mirror and The Telegraph.

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