Crossword Genius

Coin you don't see because you're short-sighted? (8)

Ross

I believe the answer is:

farthing

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

'coin' is the definition.
(farthing is a kind of coin)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for farthing that I've seen before include "once of minimal value" , "Smallest coin once" , "Old piece" , "of negligible value" , "Obsolete small coin" .)

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