Spoil vote, as one looking for revolution? (4)

I believe the answer is:

marx

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'one looking for revolution?' is the definition.
The definition suggests a singular noun which matches the answer.

'spoil vote' is the wordplay.
'spoil' becomes 'mar' (synonyms).
'vote' becomes 'x' (how votes are marked).
'mar'+'x'='MARX'

'as' acts as a link.

Can you help me to learn more?

(Other definitions for marx that I've seen before include "The Economist" , "Harpo's surname" , "Karl -, (Das Kapital)" , "Groucho, Harpo, Chico, Zeppo, Gummo - or Karl?" , "controversial writer" .)

I've seen this clue in The Guardian.

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