Unidentified travelling salesmen (8)
I believe the answer is:
nameless
'unidentified' is the definition.
(synonyms)
'travelling salesmen' is the wordplay.
'travelling' indicates an anagram.
'salesmen' is an anagram of 'NAMELESS'.
(Other definitions for nameless that I've seen before include "Salesmen lacking identity" , "Lacking means of identification" , "Anonymous; unspeakable" , "not easily identified?" , "like the guy in the spaghetti movies?" .)