Swiss scattered in the vale (9)
I believe the answer is:
helvetian
'swiss' is the definition.
(I've seen this in another clue)
'scattered in the vale' is the wordplay.
'scattered' indicates anagramming the letters.
'in'+'the'+'vale'='inthevale'
'inthevale' is an anagram of 'HELVETIAN'.
(Other definitions for helvetian that I've seen before include "Zurich inhabitant" , "Swiss" , "European" .)