State seizing Grand Duke settled abroad (9)
I believe the answer is:
Here is my best explanation:
'settled abroad' is the definition.
'state seizing grand duke' is the wordplay.
'state' becomes 'emirate' (I've seen this before**).
'seizing' is an insertion indicator.
'grand' becomes 'g' ('G' can be a synonym of 'grand').
'duke' becomes 'd'.
'emirate' going around 'g' is 'emigrate'.
(Other definitions for emigrated that I've seen before include "Went abroad to live", "moved overseas", "Moved abroad" and "gone away?".)