"Right Here Waiting" singer Richard (4)

I believe the answer is:

marx

(Other definitions for marx that I've seen before include "Karl -, nineteenth century German socialist" , "Communist hero" , "Groucho, Harpo, Chico, Zeppo, Gummo - or Karl?" , "Second part of 20" , "Das Kapital author" .)

I've seen this clue in the LA Times.

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