Reported European survey (4)
I believe the answer is:
poll
'survey' is the definition.
(I know that poll is a more specific form of the action survey)
'reported european' is the wordplay.
'reported' indicates a 'sounds like' (homophone) clue.
'european' becomes 'Pole' (someone from Poland).
'pole' is a homophone of 'POLL'.
(Other definitions for poll that I've seen before include "Take away" , "Votes cast at an election" , "Sort of tax" , "one proverbially sick?" , "less ambitious students" .)