A gambler or no longer having the bug (6)

I believe the answer is:

better

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'a gambler' is the definition.
(someone who makes bets is a gambler)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for better that I've seen before include "More acceptable" , "One may lay" , "Improve upon" , "More effectively" , "Person taking a risk" .)

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