A gambler or no longer having the bug (6)
I believe the answer is:
better
'a gambler' is the definition.
(someone who makes bets is a gambler)
I can't explain the remainder of the clue.
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" .)