State unfortunately having a king overthrown (6)
I believe the answer is:
alaska
'state' is the definition.
(Alaska is an example)
'unfortunately having a king overthrown' is the wordplay.
'unfortunately' becomes 'alas' (I've seen this before).
'having' is a charade indicator (letters next to each other).
'king' becomes 'k'.
'overthrown' says the letters should be written backwards.
'a'+'k'='ak'
'ak' back-to-front is 'ka'.
'alas'+'ka'='ALASKA'
(Other definitions for alaska that I've seen before include "Most northerly state of America" , "Northmost US state" , "Most northerly US state" , "Anchorage is the largest city" , "Largest US state by area" .)