Something to do with saintliness (4)

I believe the answer is:

good

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'saintliness' is the definition.
The definition and answer can be both human attributes as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

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

Can you help me to learn more?

(Other definitions for good that I've seen before include "(Of child) well-behaved" , "Admirable" , "Carol character from 1 as of old" , "Fine" , "Of a high standard" .)

I've seen this clue in the Evening Standard.

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