Walk Frenchman into trap (5)
I believe the answer is:
tramp
'walk' is the definition.
(tramp is a kind of walk)
'frenchman into trap' is the wordplay.
'frenchman' becomes 'm' (abbreviation for Monsieur - like 'Mr').
'into' indicates putting letters inside.
'm' placed into 'trap' is 'TRAMP'.
(Other definitions for tramp that I've seen before include "cargo boat" , "Go heavily" , "Walk heavily or wearily" , "Walk with heavy steps like hobo" , "Walk noisily; vagrant" .)