He claims the chair is his (9)
I believe the answer is:
professor
This clue might be a double definition.
'he claims' is the first definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'chair is his' is the second definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'the' acts as a link.
Can you help me to learn more?
(Other definitions for professor that I've seen before include "Senior university teacher" , "One who claims" , "Member of an academic faculty" , "One affirming faith" , "High-ranking academic" .)