To do wrong and possibly lose out, can mean a lot (6)
I believe the answer is:
oodles
'a lot' is the definition.
(oodles means a large amount)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for oodles that I've seen before include "Large number or amount" , "a feast" , "Informally, great quantities" , "'Loads, lots (6)'" , "Lots (colloq.)" .)