Deceitfulness (9)

I think it could be either:

Which length description are you looking for?:

perfidy

'deceitfulness' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for perfidy that I've seen before include "Deceitfulness" , "Breach of faith" , "Betrayal" , "Duplicity" .)

I've seen this clue in the L.A. Times Daily, the Universal and The Times.

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