Farewell from a girl at European university (5)
I believe the answer is:
adieu
'farewell' is the definition.
(adieu is a kind of farewell)
'a girl at european university' is the wordplay.
'a girl' becomes 'adi' ().
'at' is a charade indicator (letters next to each other).
'european' becomes 'E' (abbreviation e.g. EU).
'university' becomes 'U' (abbreviation for university).
'adi'+'e'+'u'='ADIEU'
'from' is the link.
(Other definitions for adieu that I've seen before include "Farewel" , "Gallic goodbye" , "Farewell (French)" , "A valediction" , "Goodbye, monsieur" .)