Pays tribute to revolutionary on the radio (5)

I believe the answer is:

marks

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'pays tribute to' is the definition.
I can't tell whether this definition defines the answer.

'revolutionary on the radio' is the wordplay.
'revolutionary' becomes 'marx' (Karl Marx).
'on the radio' shows a homophone (sound like).
'marx' is a homophone of 'MARKS'.

Can you help me to learn more?

(Other definitions for marks that I've seen before include "Former German currency" , "Goals" , "Targets" , "Stains" , "Visible impressions" .)

I've seen this clue in the Sydney Morning Herald.

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