Crossword Genius

To incompletely perform bad D.I.Y. would imply deceit (7)

Ross

I believe the answer is:

perfidy

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

I can't explain the rest of the clue.

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

I've seen this clue in the Evening Standard.
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