Mission involved maybe capturing elite Nazis (7)
I believe the answer is:
embassy
'mission' is the definition.
(I know that embassy is a type of mission)
'involved maybe capturing elite nazis' is the wordplay.
'involved' indicates anagramming the letters (involved can mean confusing or complex).
'capturing' means one lot of letters goes inside another.
'elite nazis' becomes 'ss' (the SS was a Nazi organisation. I am not sure about the 'elite' bit.).
'maybe' anagrammed gives 'embay'.
'embay' placed around 'ss' is 'EMBASSY'.
Can you help me to learn more?
(Other definitions for embassy that I've seen before include "Diplomatic office or residence." , "Diplomatic mission" , "foreign mission abroad" , "Overseas mission" , "Consulate" .)