Information found by girl in a Swiss city (6)
I believe the answer is:
geneva
'a swiss city' is the definition.
(I've seen this before)
'information found by girl' is the wordplay.
'information' becomes 'gen' (gen can informally mean information).
'found by' means one lot of letters go next to another.
'girl' becomes 'Eva' (girl's name).
'gen'+'eva'='GENEVA'
'in' acts as a link.
(Other definitions for geneva that I've seen before include "city of biblical significance" , "Convention site" , "Swiss city (Convention)" , "International agreement on the treatment of civilians and captured or wounded military personnel in wartime" , "Swiss city and canton" .)