Raider (7)

I believe the answer is:

invader

'raider' is the definition.
(thesaurus)

This is all the clue.

(Other definitions for invader that I've seen before include "far from welcome guest" , "Attacker from outside" , "One enters by force to conquer" , "One illegally entering" , "Encroacher" .)

I've seen this clue in The Independent, The Washington Post, the Penny Press, the Wall Street Journal, The Telegraph, The Times and The Sun.

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