Unfortunately need to support Austria (5)
I believe the answer is:
alack
'unfortunately' is the definition.
(I've seen this before)
'need to support austria' is the wordplay.
'need' becomes 'lack' (lack is a kind of need).
'to support' says to put letters next to each other.
'austria' becomes 'a'.
'lack' put after 'a' is 'ALACK'.
(Other definitions for alack that I've seen before include "I mourn" , "unfortunately" , "Old expression of dismay" , "Sadly" , "I'm sorry to say" .)