Unopened Hungarian wine gets an endorsement (4)
I believe the answer is:
okay
'endorsement' is the definition.
(okay is a kind of endorsement)
'unopened hungarian wine' is the wordplay.
'unopened' means to remove the first letter.
'hungarian wine' becomes 'tokay' (I've seen this before).
'tokay' with its first letter taken off is 'OKAY'.
'gets an' is the link.
(Other definitions for okay that I've seen before include "in reasonable health?" , "Permissible; fairly good" , "Passable" , "Leave" , "All right; sanction" .)