Heads (as opposed to tails) (7)
I believe the answer is:
obverse
'heads as opposed to tails' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for obverse that I've seen before include "monarch's head here" , "Serving as a counter-part" , "Side of coin that bears principal design or head" , "Side normally seen" , "Side of a coin with the main design" .)