Crossword Genius

Polite bore, chap needling everyone, initially looking embarrassed (4-8)

Ross

I believe the answer is:

well-mannered

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

I can't explain the remainder of the clue.

Can you help me to learn more?

(Another definition for well-mannered that I've seen is " Polite".)

I've seen this clue in The Times.
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