Banker makes home with more elaborate exterior (9)
I believe the answer is:
financier
'banker' is the definition.
(I've seen this before)
'home with more elaborate exterior' is the wordplay.
'home with' becomes 'in' (to be in is to be (at) home. I am not sure about the 'with' bit.).
'more elaborate' becomes 'fancier' ('fancy' can be similar in meaning to 'elaborate').
'exterior' is an insertion indicator (some letters go on the outside of others).
'in' inserted within 'fancier' is 'FINANCIER'.
'makes' is the link.
Can you help me to learn more?
(Other definitions for financier that I've seen before include "Money transactor" , "One handling money" , "expert on money matters" , "Businessman" , "Investor" .)