Spent in riotous living (10)
I believe the answer is:
dissipated
'spent' is the definition.
(thesaurus)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for dissipated that I've seen before include "Overindulgent" , "Squandered - debauched" , "Degenerate" , "wasted?" , "Dissolute" .)