Enthusiast taking in a money expert (9)
I believe the answer is:
financier
'a money expert' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'enthusiast taking in' is the wordplay.
'enthusiast' becomes 'fancier' (synonyms).
'taking' is an insertion indicator.
'fancier' going around 'in' is 'FINANCIER'.
Can you help me to learn more?
(Other definitions for financier that I've seen before include "One handling money" , "Person engaged in large money transactions" , "expert on money matters" , "Manager of large-scale monetary resources" , "Money transactor" .)