Crossword Genius

A sin that's allowed (6)

Ross

I believe the answer is:

agreed

'allowed' is the definition.
(to agree to something is to allow it)

'a sin' is the wordplay.
'sin' becomes 'greed' (greed is a kind of sin).
'a'+'greed'='AGREED'

'that's' acts as a link.

(Other definitions for agreed that I've seen before include "acceptable" , "Was fitting" , "That's right" , "matched" , "Gave consent" .)

I've seen this clue in The Independent.
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