Crossword Genius

Making sport of polishing things off (8)

Ross

I believe the answer is:

scoffing

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'making sport' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps you can see an association between them that I don't see?

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

Can you help me to learn more?

(Other definitions for scoffing that I've seen before include "eating" , "taking the mickey" , "Rapidly putting away" , "Consumption" .)

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