Crossword Genius

Where it’s a sin to gamble in company? (6)

Ross

I believe the answer is:

casino

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'where' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

'a sin to gamble in company?' is the wordplay.
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'gamble' becomes 'a' (I can't justify this - if you can you should give a lot more credence to this answer).
'in' indicates putting letters inside.
'company?' becomes 'co' (abbreviation).
'sin' after 'a' is 'asin'.
'asin' placed into 'co' is 'CASINO'.

'it's' acts as a link.

Can you help me to learn more?

(Other definitions for casino that I've seen before include "game of cards" , "Las Vegas establishment" , "gambling organisation" , "Where some gamblers go" , "enterprise?" .)

I've seen this clue in the Evening Standard.
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