Is he found in literary haunts? (11)
I believe the answer is:
ghostwriter
'is he found in literary haunts?' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
This is all the clue.
Can you help me to learn more?
(Other definitions for ghostwriter that I've seen before include "Author denied credit" , "Maybe Sheridan Le Fanu" , "scibe for the incapable" , "second involved in an autobiography?" .)