Crossword Genius

One giving friendly proof of literacy (3,3)

Ross

I believe the answer is:

pen pal

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'one giving friendly proof of literacy' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

This is all the clue.

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(Other definitions for pen pal that I've seen before include "Friend you know only through correspondence" , "juvenile writer" , "Mail friend" , "A friend who communicates through correspondence" , "Friend who communicates in writing" .)

I've seen this clue in the Evening Standard.
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