Man occupying the chair of state (6)
I believe the answer is:
throne
'chair of state' is the definition.
(I've seen this before)
'man occupying the' is the wordplay.
'man' becomes 'ron' (I've seen this before**).
'occupying' indicates putting letters inside.
'ron' inserted into 'the' is 'THRONE'.
(Other definitions for throne that I've seen before include "Seat of royalty" , "Chair of the monarch" , "Monarch's seat" , "Hornet (anag) -- lavatory" , "Seat of royal power" .)