Austrian vine seen unexpectedly (8)
I believe the answer is:
viennese
'austrian' is the definition.
(I've seen this before)
'vine seen unexpectedly' is the wordplay.
'unexpectedly' indicates anagramming the letters.
'vine'+'seen'='vineseen'
'vineseen' is an anagram of 'VIENNESE'.
(Other definitions for viennese that I've seen before include "Citizens of Austria's capital" , "of a European city" , "Like Strauss, say" , "relating to capital" , "Kind of waltz" .)