Intruder, somewhat impolite (4)

I believe the answer is:

rude

'impolite' is the definition.
(similar in meaning)

'intruder somewhat' is the wordplay.
'somewhat' indicates the answer is hidden within the clue.
'RUDE' can be found hidden inside 'intruder'.

(Other definitions for rude that I've seen before include "Offensively impolite" , "discourtesy" , "Impolite; unpolished" , "Uncivil" , "Ill-mannered and coarse" .)

I've seen this clue in The Everyman puzzle in The Observer.

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