Crossword Genius

Commonly do (6)

Ross

I believe the answer is:

diddle

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

I can't explain the rest of the clue.

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(Other definitions for diddle that I've seen before include "Slangily cheat or swindle" , "Fleece" , "Con - do - lidded (anag)" , "Did, and led out to cheat" , "Slang for cheat or swindle - nearly fiddle" .)

I've seen this clue in The Globe and Mail.
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