Side of a coin with the main design (7)
I believe the answer is:
obverse
'side of a coin with the main design' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for obverse that I've seen before include "Face of a coin" , "Side of coin that bears principal design or head" , "Serving as a counter-part" , "Verbose about coin side" , "Side normally seen" .)