Viewpoints seen on outskirts of every island (8)
I believe the answer is:
anglesey
'island' is the definition.
(I've seen this before)
'viewpoints seen on outskirts of every' is the wordplay.
'viewpoints' becomes 'angles' (angle is a kind of viewpoint).
'seen on' is a charade indicator (letters next to each other).
'outskirts of' says to hollow out the word (remove centre letters) (only letters on the outskirts).
'every' with its middle removed is 'ey'.
'angles'+'ey'='ANGLESEY'
(Other definitions for anglesey that I've seen before include "Welsh island" , "part of North Wales" , "Some Welsh ground" , "Welsh county" , "Island off NW tip of Wales" .)