Wrongdoing in cooler, scarcely contained (9)
I believe the answer is:
injustice
'wrongdoing' is the definition.
(I know that injustice is a type of wrongdoing)
'in cooler scarcely contained' is the wordplay.
'cooler' becomes 'ice' (something which cools).
'scarcely' becomes 'just' (I've seen this in another clue).
'contained' means one lot of letters goes inside another.
'in'+'ice'='inice'
'inice' going around 'just' is 'INJUSTICE'.
(Other definitions for injustice that I've seen before include "Unfairness" , "It's unfair" , "Lack of fairness" , "wrong" .)