Nice unmarried woman? (12)
I believe the answer is:
mademoiselle
'nice unmarried woman?' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'woman?' is the wordplay.
I cannot really see how this works, but
'woman?' could be 'demoiselle' (demoiselle is a kind of woman) and 'demoiselle' is located in the answer.
The remaining letters 'ma' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for mademoiselle that I've seen before include "French miss" , "Young lady" , "Foreign woman" , "Parisian girl" , "French girl; governess" .)