Heard European involved in scandal turned up (5)
I believe the answer is:
tried
'heard' is the definition.
(as in trying or hearing in a trial)
'european involved in scandal turned up' is the wordplay.
'european' becomes 'E' (abbreviation e.g. EU).
'involved in' indicates putting letters inside.
'scandal' becomes 'dirt' (synonyms).
'turned up' says the letters should be written in reverse.
'e' placed inside 'dirt' is 'deirt'.
'deirt' in reverse letter order is 'TRIED'.
(Other definitions for tried that I've seen before include "Attempted" , "Annoyed when obliged to accept a rule" , "Put to the test" , "Essayed" , "tasted" .)