Study of dentistry? (3)
I believe the answer is:
den
This clue could be a double definition.
'study' is the first definition.
(term for a study or office)
'dentistry?' is the second definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for den that I've seen before include "Lair for animal or study for gent" , "Animal's home or gent's study" , "Animal's lair or gent's study" , "Animal's lair or man's study" , "Animal shelter" .)