Policeman demanding dope from Parisian carrying weapon (8)
I believe the answer is:
gendarme
'policeman' is the definition.
(gendarme is a kind of policeman)
'dope from parisian carrying weapon' is the wordplay.
'dope' becomes 'gen' (I've seen this in other clues).
'from parisian' becomes 'de' ('from' in French, eg in Paris).
'carrying' indicates putting letters inside.
'weapon' becomes 'arm' (synonyms).
'de' enclosing 'arm' is 'darme'.
'gen'+'darme'='GENDARME'
'demanding' is the link.
(Other definitions for gendarme that I've seen before include "French policeman has me in danger" , "Law enforcer" , "Busy" , "French police officer" , "Foreign policeman" .)