Obscure travelling salesmen (8)
I believe the answer is:
nameless
'obscure' is the definition.
(thesaurus)
'travelling salesmen' is the wordplay.
'travelling' is an anagram indicator.
'salesmen' with letters rearranged gives 'NAMELESS'.
(Other definitions for nameless that I've seen before include "Lacking means of identification" , "This undistinguished" , "Too unpleasant" , "Unidentified" , "Difficult to describe" .)