Ruined tub with prank going wrong (8)
I believe the answer is:
bankrupt
'ruined' is the definition.
(thesaurus)
'tub with prank going wrong' is the wordplay.
'with' is a charade indicator (letters next to each other).
'going wrong' indicates an anagram.
'tub' after 'prank' is 'pranktub'.
'pranktub' with letters rearranged gives 'BANKRUPT'.
(Other definitions for bankrupt that I've seen before include "With no redeeming qualities" , "By no means" , "Person legally declared to be unable to pay debts" , "Broke" , "finished trading" .)