Expert gets money after party (5)
I believe the answer is:
doyen
'expert' is the definition.
(doyen is a kind of expert)
'money after party' is the wordplay.
'money' becomes 'yen' (Japanese currency).
'after' means one lot of letters go next to another.
'party' becomes 'do' (do can informally mean a party).
'yen' put after 'do' is 'DOYEN'.
'gets' is the link.
(Other definitions for doyen that I've seen before include "Respected expert" , "Senior practitioner" , "Dean of an academy" , "Top expert in a field" , "Senior male figure in a profession" .)