Crossword Genius

Sight in glasses slightly reduced (9)

Ross

I believe the answer is:

spectacle

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

'sight' is the definition.
(I know that spectacle is a type of sight)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for spectacle that I've seen before include "worth looking at" , "Entertaining sight, they help to see in the plural" , "Wonder" , "sensational event" , "what may be regarded as > ridiculous" .)

I've seen this clue in The Telegraph.
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