Impetus for Fogg's journey (3)

I believe the answer is:

bet

'impetus for fogg's journey' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for bet that I've seen before include "Speculation" , "Wager, back" , "Money risked on a gamble" , "'Stake, wager (3)'" , "22 across will accept one" .)

I've seen this clue in the Newsday and the Newsday.com.

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