German has a French revolver (3)
I believe the answer is:
gun
'revolver' is the definition.
(I've seen this in another clue)
'german has a french' is the wordplay.
'german' becomes 'g' (abbreviation).
'has' is a charade indicator (letters next to each other).
'a french' becomes 'un' ('a' in French).
'g'+'un'='GUN'
(Other definitions for gun that I've seen before include "Shooter" , "Firearm" , "Hand weapon" , "Hired killer" , "Artillery piece" .)