Authoritarian trait men disguised (8)
I believe the answer is:
martinet
'authoritarian' is the definition.
(martinet is a kind of authoritarian)
'trait men disguised' is the wordplay.
'disguised' indicates an anagram.
'trait'+'men'='traitmen'
'traitmen' with letters rearranged gives 'MARTINET'.
(Other definitions for martinet that I've seen before include "Trite man becomes a tyrant" , "General" , "Rigorous figure" , "Despot" , "Tyrant, one who demands strict obedience" .)