European bridge, one over a road (8)
I believe the answer is:
spaniard
'european' is the definition.
(someone from Spain)
'bridge one over a road' is the wordplay.
'bridge' becomes 'span' (synonyms).
'one' becomes 'I' (Roman numeral).
'over' means one lot of letters go next to another.
'road' becomes 'rd' (abbreviation).
'span'+'i'+'a'+'rd'='SPANIARD'
(Other definitions for spaniard that I've seen before include "Eg, a native of Madrid" , "A native of Iberian country" , "Person from Eurozone" , "Native of southern European country" , "Nadal perhaps" .)