Flat shared by a woman and a motherless man (4)
I believe the answer is:
even
'flat' is the definition.
(level)
'shared by a woman and a motherless man' is the wordplay.
I cannot really understand how this works, but
'woman' could be 'eve' (Eve is an example) and 'eve' is present in the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is found within the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for even that I've seen before include "Nearly" , "Level, par" , "Regular - smooth" , "Flat, smooth and divisible by two" , "Constant" .)