Satire keeps Rodney in the money (6)
I believe the answer is:
parody
'satire' is the definition.
(I've seen this in another clue)
'rodney in the money' is the wordplay.
'rodney' becomes 'rod' (I am not sure about this - if you are sure you should believe this answer much more).
'in the' is an insertion indicator.
'money' becomes 'pay' (I've seen this in other clues).
'rod' inserted within 'pay' is 'PARODY'.
'keeps' acts as a link.
Can you help me to learn more?
(Other definitions for parody that I've seen before include "Satire - burlesque" , "a lampoon or comic imitation" , "Travesty" , "Send up" , "Comic imitation of, say, well-known literary style" .)