Person of authority seizing account (9)
I believe the answer is:
character
'person' is the definition.
(character is a kind of person)
'authority seizing account' is the wordplay.
'authority' becomes 'charter' (I've seen this in other clues).
'seizing' indicates putting letters inside.
'account' becomes 'ac'.
'charter' placed around 'ac' is 'CHARACTER'.
'of' acts as a link.
(Other definitions for character that I've seen before include "Part" , "strength of mind" , "card" , "Imaginary person in a work of fiction" , "Distinctive nature" .)