Accepted things from dealer and was sacked (3,4,5)
I believe the answer is:
got ones cards
'was sacked' is the definition.
(to get one's cards is to be dismissed from a job)
'accepted things from dealer and' is the wordplay.
I cannot really see how this works, but
'accepted' could be 'a' (financial abbreviation) and 'a' is found in the answer.
'from' could be 'o' (I've seen this in other clues) and 'o' is found within the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is located in the answer.
This explanation may well be incorrect...
(Another definition for got ones cards that I've seen is " Dismissed from employment".)