Happy individual bounds off, concluding novel inside (2,5,4)
I believe the answer is:
on cloud nine
'happy' is the definition.
(I've seen this in another clue)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for on cloud nine that I've seen before include "Extremely happy" , "Ecstatic" , "Elated" , "Transported" , "delighted" .)