Unwelcome visitor (7)

I believe the answer is:

invader

'unwelcome visitor' is the definition.
(an invader is an unwelcome intruder)

This is all the clue.

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

I've seen this clue in The Guardian.

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