Marxist lark maybe (4)

I believe the answer is:

karl

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'marxist' is the definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?

'lark maybe' is the wordplay.
'maybe' indicates anagramming the letters.
'lark' is an anagram of 'KARL'.

Can you help me to learn more?

(Other definitions for karl that I've seen before include "-- Marx, socialist" , "Founder of communism, . . . . Heinrich Marx" .)

I've seen this clue in the Evening Standard.

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