Europeans ruined Paris and east of Calais (9)
I believe the answer is:
spaniards
'europeans' is the definition.
(people from Spain)
'ruined paris and east of calais' is the wordplay.
'ruined' indicates anagramming the letters.
'east of' indicates one should take the final letters (the letter at the right or eastern end of the word).
The last letter of 'calais' is 's'.
'paris'+'and'='parisand'
'parisand' with letters rearranged gives 'spaniard'.
'spaniard'+'s'='SPANIARDS'
(Other definitions for spaniards that I've seen before include "Pass dinar to Europeans" , "Iberians" , "Natives of Seville, say" .)