Crossword Genius

One of the three Rs (7)

Ross

I think it could be either:

reading

writing

'one of the three rs' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for reading that I've seen before include "red-brick uni" , "Perusing; university in Berkshire" , "Town west of London" , "Knowledge of literature" , "University - studying" .)

I've seen this clue in The Guardian and The Independent.
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