Diva and demure megastar sharing male (5,5)
I believe the answer is:
prima donna
'diva' is the definition.
(I know that diva can be written as prima donna)
'and demure megastar sharing male' is the wordplay.
I cannot quite see how this works, but
'and' could be 'n' (common abbreviation for 'and') and 'n' is found within the answer.
'demure' could be 'prim' (I've seen this in another clue) and 'prim' is present in the answer.
'male' could be 'don' (Don is an example) and 'don' is located in the answer.
The remaining letters 'aa' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for prima donna that I've seen before include "Female opera star" , "drama queen" , "Top female singer" , "Very self-important person" , "(Over-sensitive) leading lady" .)