One producing spirited autobiography? (5,6)
I believe the answer is:
ghost writer
'one producing spirited autobiography?' is the definition.
The definition suggests a singular noun which matches the answer.
This is the entire clue.
(Other definitions for ghost writer that I've seen before include "Not the credited author" , "Person writing for another who takes the credit" , "One producing book in another's name" , "Uncredited author" , "One who pens another's book" .)