After Betfred ruined me, finally back in the black (4,4)

'back in the black' is the definition.

'after betfred ruined me finally' is the wordplay.
'after' is a charade indicator (letters next to each other).
'ruined' indicates anagramming the letters.
'finally' suggests the final letters.
The last letter of 'me' is 'e'.
'betfred' with letters rearranged gives 'debtfre'.
'debtfre' put next to 'e' is 'DEBT FREE'.