Tries again to get European train (8)
I believe the answer is:
rehearse
'train' is the definition.
(I've seen this before)
'tries again to get european' is the wordplay.
'tries again' becomes 'rehears' ('hears' can be a synonym for 'tries' so perhaps 'rehears' is OK for 'tries again').
'to get' means one lot of letters go next to another.
'european' becomes 'e' (abbreviation e.g. EU).
'rehears'+'e'='REHEARSE'
(Other definitions for rehearse that I've seen before include "Practise (one's lines)" , "What actor does to prepare for play" , "Run through (a play)" , "Practise before performing in public" , "Practice for the performance" .)