Dope with European camper possibly is Swiss (7)
I believe the answer is:
genevan
'is swiss' is the definition.
(I've seen this before)
'dope with european camper' is the wordplay.
'dope' becomes 'gen' (both can mean information).
'with' says to put letters next to each other.
'european' becomes 'e' (abbreviation e.g. EU).
'camper' becomes 'van' (van is a kind of camper).
'gen'+'e'+'van'='GENEVAN'
'possibly' acts as a link.
(Other definitions for genevan that I've seen before include "Calvinist" , "Swiss" .)