Crossword Genius

Spear dropped on Marx (5)

Ross

I believe the answer is:

harpo

'marx' is the definition.
(Harpo Marx)

I don't understand how the remainder of the clue works.

(Other definitions for harpo that I've seen before include "Silent Marx brother" , "one from family of comedians" , "silent film star" , "The dumb Marx brother" , "One of the Marx Brothers" .)

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