Crossword Genius

Did Karl take a month to get cross? (4)

Ross

I believe the answer is:

marx

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'did karl take a' is the definition.
I can't judge whether this defines the answer.

'month to get cross?' is the wordplay.
'month' becomes 'Mar' (short for March).
'to get' is a charade indicator (letters next to each other).
'cross?' becomes 'x' (X is cross-shaped).
'mar'+'x'='MARX'

Can you help me to learn more?

(Other definitions for marx that I've seen before include "The Economist" , "Karl -, nineteenth century German socialist" , "Karl, top communist" , "controversial writer" , "Red" .)

I've seen this clue in the Evening Standard.
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