Impressed by European flight (8)
I believe the answer is:
stampede
'flight' is the definition.
(I've seen this before)
'impressed by european' is the wordplay.
'impressed' becomes 'stamped' (stamping is a kind of impressing).
'by' says to put letters next to each other.
'european' becomes 'e' (abbreviation e.g. EU).
'stamped'+'e'='STAMPEDE'
(Other definitions for stampede that I've seen before include "Headlong rush of a group in panic" , "Headlong rush of animals" , "Chaotic rush" , "Neat rush" , "A flight of frightened cattle" .)