copper's nark

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Noun1.copper's nark - an informer or spy working for the police
Britain, Great Britain, U.K., UK, United Kingdom, United Kingdom of Great Britain and Northern Ireland - a monarchy in northwestern Europe occupying most of the British Isles; divided into England and Scotland and Wales and Northern Ireland; `Great Britain' is often used loosely to refer to the United Kingdom
betrayer, blabber, informer, squealer, rat - one who reveals confidential information in return for money
References in classic literature ?
Explaining to the note taker] She thought you was a copper's nark, sir.
THE BYSTANDER [inept at definition] It's a--well, it's a copper's nark, as you might say.
Mainly because, for years, he played a copper's nark who read the Crimewatch autocue which made pensioners stay awake at night clutching a poker in one hand and their life savings in the other.
She has now become a sort of copper's nark, an "if you're innocent, what have you got to hide ?
If anyone else but Mr Mulhearn was involved nothing would have happened but the Militants regard Mr Fleming as a copper's nark so his face no longer fits.