Untrustworthy person (5)

I believe the answer is:

knave

'untrustworthy person' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for knave that I've seen before include "one found amongst thieves" , "Rat" , "Jack - scoundrel" , "Varlet; Jack" , "Unscrupulous man; jack" .)

I've seen this clue in The Guardian, the Newsday, the Newsday.com and the USA Today.

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