Undistinguished salesmen getting sacked (8)

I believe the answer is:

nameless

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'undistinguished' is the definition.
(thesaurus)

'salesmen getting sacked' is the wordplay.
'salesmen' anagrams to 'NAMELESS'.
Though, I'm not clear how this is indicated.

Can you help me to learn more?

(Other definitions for nameless that I've seen before include "Salesmen lacking identity" , "Difficult to describe" , "Too unpleasant" , "like the guy in the spaghetti movies?" , "Unidentified" .)

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