It amazes them and is seen in abundance after bishop becomes saint (8)

I believe the answer is:

astounds

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

'it amazes them and is seen in abundance after bishop' is the definition.
The definition suggests a singular noun but the answer is not.

'saint' is the wordplay.
I cannot quite see how this works, but
'saint' could be 'st' (abbreviation) and 'st' is located in the answer.
This explanation may well be incorrect...

'becomes' acts as a link.

Can you help me to learn more?

(Another definition for astounds that I've seen is " Amazes, astonishes".)

I've seen this clue in The Irish Times.

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