One pretends one owns a chair (9)
I believe the answer is:
professor
This clue is a double definition.
'one pretends' is the first definition.
(someone who professes or pretends things)
'one owns a chair' is the second definition.
(chair can mean a professorship)
(Other definitions for professor that I've seen before include "Senior member of college faculty" , "High-ranking academic" , "One holds a chair" , "Head of faculty, department" , "One who claims" .)