Crossword Genius

Just five letters and a digit (3)

Ross

I believe the answer is:

toe

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

'digit' is the definition.
(toe is a kind of digit)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for toe that I've seen before include "Pedal extremity" , "One's nailed" , "low digit" , "Pedal digit" , "Lower digit" .)

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