Crossword Genius

By which I mean an offence (2,2)

Ross

I believe the answer is:

as in

'by which i mean' is the definition.
('as in' can be used to introduce a clarification)

'an offence' is the wordplay.
'an' becomes 'a'.
'offence' becomes 'sin' (I've seen this before).
'a'+'sin'='AS IN'

(Another definition for as in that I've seen is " meaning".)

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