Vagrant Frenchman into gin (5)
I believe the answer is:
tramp
'vagrant' is the definition.
(I know that tramp is a type of vagrant)
'frenchman into gin' is the wordplay.
'frenchman' becomes 'm' (abbreviation for Monsieur - like 'Mr').
'into' means one lot of letters goes inside another.
'gin' becomes 'trap' (I've seen this in other clues).
'm' put within 'trap' is 'TRAMP'.
(Other definitions for tramp that I've seen before include "Attack with knife" , "Hike" , "Footslog" , "Traveller" , "Merchant ship" .)