"Marx", the musical (5)
I believe the answer is:
harpo
'marx' is the definition.
(Harpo Marx)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for harpo that I've seen before include "The mute Marx Brother" , "One of the Marx Brothers" , "brother who never speaks" , "silent film star" , "one from family of comedians" .)