Magician to come in about detective (9)
I believe the answer is:
enchanter
'detective' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe there's a link between them I don't understand?
'magician to come in about' is the wordplay.
'magician' becomes 'chan' (I can't justify this - if you can you should believe this answer much more).
'to come in' becomes 'enter' (synonyms).
'about' indicates putting letters inside.
'chan' placed within 'enter' is 'ENCHANTER'.
Can you help me to learn more?
(Other definitions for enchanter that I've seen before include "One charming" , "siren, possibly" , "magician" .)