Symbol of office (4)
I believe the answer is:
seal
'symbol of office' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for seal that I've seen before include "Settle or decide - say fate" , "Stamped wax; mammal" , "Insignia for sale" , "See 7" , "Authorise - plug" .)