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Fool (4)

Ross

'fool' is the definition.
(I know that dupe is a more specific form of betray)

This is the entire clue.

(Other definitions for dupe that I've seen before include "A cat's-paw" , "One who is cheated" , "Gull" , "Put one over on, cod" , "Puppet" .)

I've seen this clue in the Newsday, the Sydney Morning Herald, The Guardian, the Penny Press, The New York Times, the LA Times, The Sun and The Mirror.
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