At the casino, a call for no cab? (5)

I believe the answer is:

banco

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

'at the casino a call' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'no cab?' is the wordplay.
'no cab' anagrams to 'BANCO'.
Though, I'm not sure how this is indicated.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for banco that I've seen before include "Game" , "Prohibit company banking money" .)

I've seen this clue in the Evening Standard.

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