A drop for all to see in vale (5)
I believe the answer is:
adieu
'vale' is the definition.
(both can mean farewell)
'a drop for all to see' is the wordplay.
'drop' becomes 'die'.
'for all to see' becomes 'u' (universal dvd certificate).
'a'+'die'+'u'='ADIEU'
'in' is the link.
(Other definitions for adieu that I've seen before include "Farewell (French)" , "Fare thee well!" , "Farewel" , "Farewell to France" , "All the best" .)