Crossword Genius

A sin that's approved (6)

Ross

I believe the answer is:

agreed

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'approved' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?

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

'that's' acts as a link.

Can you help me to learn more?

(Other definitions for agreed that I've seen before include "Jointly decided" , "Acquiesed, concurred" , "Let's do it!" , "came to the same conclusion" , "Did concur" .)

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