Crossword Genius

Indicates that one is literate? (5)

Ross

I believe the answer is:

signs

I'm a little stuck... Click here to teach me more about this clue!

'indicates' is the definition.
The answer and definition can be both to do with communicating as well as being verbs in their -s form.
Perhaps there's a link between them I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for signs that I've seen before include "Notices; gestures" , "Marks" , "Indications" , "Endorses" , "Pens name" .)

I've seen this clue in the Evening Standard.
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