Goodness! Patience is one of them (6)

I believe the answer is:

virtue

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

'goodness' is the definition.
(I know that virtue is a type of goodness)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for virtue that I've seen before include "Admirable quality" , "Merit; chastity" , "good thing" , "Admirable feature" , "Rectitude" .)

I've seen this clue in The Mirror.

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