Crossword Genius

About to go astray ending with nothing here, I bet (6)

Ross

I believe the answer is:

casino

I'm a little stuck... Click here to teach me more about this clue!

'here i bet' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps you can see an association between them that I don't see?

'about to go astray ending with nothing' is the wordplay.
'about' becomes 'ca' (short for circa).
'to go astray' becomes 'sin' (I've seen this in another clue).
'ending with' is a charade indicator (letters next to each other).
'nothing' becomes 'O' (looks like zero - 0).
'ca'+'sin'+'o'='CASINO'

Can you help me to learn more?

(Other definitions for casino that I've seen before include "--- Royale (Fleming)" , "Gaming house" , "Where one may gamble" , "Gaming club" , "Gambling venue" .)

I've seen this clue in The Guardian.
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