Crossword Genius

In more ways than one, I'm clued up (4)

Ross

I believe the answer is:

wise

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

'in' is the definition.
Both the definition and answer are adjectives. Perhaps there's a link between them I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for wise that I've seen before include "Old way" , "comedian" , "` `A word to the .... is enough' '" , "Astute" , "Showing sagacity" .)

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