Crossword Genius

Something a square peg can’t do (4)

Ross

I believe the answer is:

roll

I'm a little stuck...
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Here is my best explanation:

'do' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe you can see a link between them that I don't see?

I cannot understand how the rest of the clue works.

Ross

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This clue was last seen in Evening Standard

(Other definitions for roll that I've seen before include "Rob while sleeping < to pass", "Bap", "bakery's product", "Bun", "Move on wheels - individual portion of bread", "See 19", "It may be called", "Official list; cylinder", "something on the drums" and "Cylinder (of paper etc)".)

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