"I'm game!"

I think it could be either:

Which length description are you looking for?:

lets

'i'm game' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for lets that I've seen before include "Allows or causes to" , "we shall serve them again!" , "Leases" , "Yes" , "Rents out or allows" .)

I've seen this clue in the LA Times and the USA Today.

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