Salesman revises orders, being dictatorial (10)
I believe the answer is:
repressive
'dictatorial' is the definition.
(thesaurus)
'salesman revises orders' is the wordplay.
'salesman' becomes 'rep' (I've seen this before).
'orders' is an anagram indicator.
'revises' with letters rearranged gives 'ressive'.
'rep'+'ressive'='REPRESSIVE'
'being' is the link.
(Other definitions for repressive that I've seen before include "Restraining personal freedom" , "Subjugating" .)