Idiot stealing article from continental port (5)

I believe the answer is:

twerp

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'idiot' is the definition.
(both can mean a fool)

I cannot understand how the rest of the clue works.

(Other definitions for twerp that I've seen before include "Nitwit" , "Nincompoop" , "Foolish fellow" , "Foolish person (slang)" , "Twit" .)

I've seen this clue in The Times.

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