Western actor playing evil men, including a Republican (3,6)

I believe the answer is:

lee marvin

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'western actor' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'playing evil men including a republican' is the wordplay.
'playing' indicates an anagram.
'including' is an insertion indicator.
'republican' becomes 'R' (abbreviation in US politics).
'evil'+'men'='evilmen'
'evilmen' is an anagram of 'leemvin'.
'a'+'r'='ar'
'leemvin' enclosing 'ar' is 'LEE MARVIN'.

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