Demure girl sharing male? That’s original (7)
I believe the answer is:
primary
'original' is the definition.
(associated in meaning)
'demure girl sharing male?' is the wordplay.
I cannot quite see how this works, but
'demure' could be 'prim' (I've seen this before) and 'prim' is found within the answer.
The remaining letters 'ary' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'that's' is the link.
Can you help me to learn more?
(Other definitions for primary that I've seen before include "Cardinal" , "Main" , "The colours from which all others can be made" , "Of chief importance" , "Paramount" .)