Has he a chapter to himself? (4)
I believe the answer is:
dean
'has he a chapter to himself?' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'has he a' is the wordplay.
'has he' becomes 'de' (I can't justify this - if you can you should give a lot more credence to this answer).
'a' becomes 'an'.
'de'+'an'='DEAN'
Can you help me to learn more?
(Other definitions for dean that I've seen before include "A senior clergyman - Swift was one" , "Administrator of a college department" , "Jonathan Swift's occupation" , "James ..., film actor" , "College official" .)