Goes off with the booty (6)
I believe the answer is:
spoils
This clue could be a double definition.
'goes off' is the first definition.
The answer and definition can be both related to change as well as being verbs in their -s form.
Perhaps they are linked in a way I don't understand?
'the booty' is the second definition.
(both can mean the proceeds or prize from something)
'with' is the link.
Can you help me to learn more?
(Other definitions for spoils that I've seen before include "Pampers with plunder?" , "Ill-gotten gains" , "Mars - plunder" , "Plunder, takings from war" , "Damages" .)