Better doctor left in Georgia with hesitation (7)
I believe the answer is:
gambler
'better' is the definition.
(a gambler is someone who bets)
'doctor left in georgia with hesitation' is the wordplay.
'doctor' becomes 'MB' (Bachelor of Medicine).
'left' becomes 'l' (common abbreviation).
'in' is an insertion indicator.
'georgia' becomes 'GA' (abbreviation for the US state).
'with hesitation' becomes 'er' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'mb'+'l'='mbl'
'ga'+'er'='gaer'
'mbl' put into 'gaer' is 'GAMBLER'.
Can you help me to learn more?
(Other definitions for gambler that I've seen before include "Risk-taker" , "one who takes chances!" , "Better" , "One who bets" , "Casino punter" .)