Corrupt salesmen not easily identified (8)
I believe the answer is:
nameless
'not easily identified' is the definition.
The answer and definition are different parts of speech. However, adjectives and past participle verbs occasionally define each other.
'corrupt salesmen' is the wordplay.
'corrupt' indicates an anagram.
'salesmen' is an anagram of 'NAMELESS'.
Can you help me to learn more?
(Other definitions for nameless that I've seen before include "Too unpleasant" , "like the guy in the spaghetti movies?" , "not easily identified?" , "Salesmen lacking identity" , "This undistinguished" .)