Where Spooner's queen may go in casual headgear? (4,3)
I believe the answer is:
flat cap
This might be a double definition.
'where spooner's queen may go in casual' is the first definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
'headgear?' is the second definition.
(flat cap is a kind of headgear)
(Other definitions for flat cap that I've seen before include "Style of headgear" , "working-class symbol" , "Type of hat" , "> lid" , "Headgear (of the working class?)" .)