The side of the head (7)
I believe the answer is:
obverse
I believe this clue is a double definition.
'the side' is the first definition.
(obverse is a kind of side)
'head' is the second definition.
(I've seen this in another clue)
'of the' is the link.
(Other definitions for obverse that I've seen before include "Side of coin that bears principal design or head" , "Side of a coin that shows the head" , "Side of the coin containing the principal figure" , "Heads as opposed to tails" , "Penny may present such a face" .)