French name given to commercial traveller (5)
I believe the answer is:
nomad
'traveller' is the definition.
(nomad is a kind of traveller)
'french name given to commercial' is the wordplay.
'french name' becomes 'nom' ('name' in French).
'given to' says to put letters next to each other.
'commercial' becomes 'ad' (abbreviation for advertisement).
'nom'+'ad'='NOMAD'
(Other definitions for nomad that I've seen before include "one must move on" , "Wanderer" , "Unsettled type" , "A member of a wandering tribe" , "is one unsettled?" .)