Morally dissolute throwing rebel in it (9)
I believe the answer is:
libertine
'morally dissolute' is the definition.
(I've seen this before)
'throwing rebel in it' is the wordplay.
'throwing' indicates anagramming the letters (letters get thrown around).
'rebel'+'in'+'it'='rebelinit'
'rebelinit' with letters rearranged gives 'LIBERTINE'.
(Other definitions for libertine that I've seen before include "Person who live immorally - sounds free" , "of roues" , "Morally dissolute" , "reprobate" , "Say, Don Giovanni" .)