Rubbish outing supported by European (5)
I believe the answer is:
tripe
'rubbish' is the definition.
('tripe' can be a synonym of 'rubbish')
'outing supported by european' is the wordplay.
'outing' becomes 'trip' (I've seen this before).
'supported by' is a charade indicator (letters next to each other) (letters go below - in down clue).
'european' becomes 'e' (abbreviation e.g. EU).
'trip'+'e'='TRIPE'
(Other definitions for tripe that I've seen before include "which a freegan might eat?" , "Garbage" , "What some northerners eat" , "Balderdash" , "Bunk" .)