He never adds anything new to his collection (9)
I believe the answer is:
antiquary
This clue might be a double definition.
'he never adds anything new' is the first definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'his collection' is the second definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'to' is the link.
Can you help me to learn more?
(Other definitions for antiquary that I've seen before include "Expert in (or collector of) old artefacts" , "Specialist in old items" , "seller of the old-fashioned?" , "Dealer in or collector of old things" .)