Crossword Genius

Many turning up old doctor injected, chancy business (7)

Ross

I believe the answer is:

tombola

'chancy business' is the definition.
(a tombola is a lottery)

I cannot understand how the rest of the clue works.

(Other definitions for tombola that I've seen before include "Lottery game" , "Game with tickets drawn from a revolving drum" , "Small lottery at fete" , "Kind of lottery draw using a revolving drum" , "Rotating drum game" .)

I've seen this clue in The Times.
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