Marxist lark, possibly? (4)

I believe the answer is:

karl

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'marxist' is the definition.
Both the answer and definition are singular nouns.
Perhaps there's a link between them I don't understand?

'lark possibly?' is the wordplay.
'possibly?' indicates anagramming the letters (I've seen 'possibly' mean this).
'lark' is an anagram of 'KARL'.

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

I've seen this clue in the Evening Standard.

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