Which side is the monarch on? (7)
I believe the answer is:
obverse
'which side is the monarch on?' is the definition.
(a monarch's face goes on the obverse of a coin)
This is the entire clue.
(Other definitions for obverse that I've seen before include "Penny may present such a face" , "Serving as a counter-part" , "Logical proposition" , "Side of coin that shows the principal design" , "monarch's head here" .)