Issue a note after return of important person (7)
I believe the answer is:
emanate
'issue' is the definition.
(thesaurus)
'a note after return of important person' is the wordplay.
'a note' becomes 'ate' (I've seen this in other clues**).
'after' says to put letters next to each other.
'return of' is a reversal indicator.
'important person' becomes 'name' (name is a kind of important person).
'name' back-to-front is 'eman'.
'ate' put after 'eman' is 'EMANATE'.
(Other definitions for emanate that I've seen before include "Flow or proceed from" , "Rise" , "Come out (of source)" , "Come forth" , "Give out, emit" .)