Risky game sanctioned in circuit (8)

I believe the answer is:

roulette

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

'game sanctioned in circuit' is the definition.
'roulette' can be an answer for 'game' (I've seen this in another clue). I'm not sure about the 'sanctioned in circuit' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for roulette that I've seen before include "risky venture" , "Gambling device" , "it's a gamble" , "SPORT/GAME" , "Form of gambling" .)

I've seen this clue in the Sydney Morning Herald.

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