Its occupants collared pinching grain? (8)
I believe the answer is:
dovecote
'grain?' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for dovecote that I've seen before include "Domestic bird shelter" , "Home for domesticated pigeons" , "Shelter for domesticated pigeons" .)