Evil found in the French city (5)
I believe the answer is:
lille
'city' is the definition.
(I've seen this before)
'evil found in the french' is the wordplay.
'evil' becomes 'ill' (I've seen this in another clue).
'found in' is an insertion indicator.
'the french' becomes 'le' ('the' in French).
'ill' put inside 'le' is 'LILLE'.
(Other definitions for lille that I've seen before include "Feeling unwell in the French town" , "City of northern France, close to Belgium" , "European city" , "Stop before Paris" , "City of N. France" .)