You do what you like with it (4,4)
I believe the answer is:
free will
'it' is the definition.
The definition suggests a singular noun which matches the answer.
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for free will that I've seen before include "ability to act without direction" , "Power to act without constraint" , "The power of choosing own course of action" , "God-given right to determine one's own actions" , "The ability to choose" .)