European health resort over sewer passed up (8)
I believe the answer is:
spaniard
'european' is the definition.
(someone from Spain)
'health resort over sewer passed up' is the wordplay.
'health resort' becomes 'spa' (spa can mean a health resort).
'over' is a charade indicator (letters next to each other) (in a down clue, some letters go over others).
'sewer' becomes 'drain' (drain can mean a sewer).
'passed up' shows that the letters should be reversed in order.
'drain' back-to-front is 'niard'.
'spa'+'niard'='SPANIARD'
(Other definitions for spaniard that I've seen before include "Person from Eurozone" , "A native of Iberian country" , "Eg, a native of Madrid" , "Nadal perhaps" , "Native of southern European country" .)