And German is in a duty list in a domed hall (7)
I believe the answer is:
rotunda
'a domed hall' is the definition.
(I've seen this before)
'and german is in a duty list' is the wordplay.
'and german' becomes 'und' ('and' in German).
'is in' means one lot of letters goes inside another.
'a duty list' becomes 'rota' (I've seen this before).
'und' inserted into 'rota' is 'ROTUNDA'.
'in' acts as a link.
(Other definitions for rotunda that I've seen before include "Circular room or building" , "Do a turn (anag) -- circular domed building" , "Italian Pantheon, for instance" , "Circular building with a dome" , "domed hall" .)