Crossword Genius

Speak well of something worn by a saint (5)

Ross

I believe the answer is:

boast

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'speak well' is the definition.
I can't tell whether this definition defines the answer.

'something worn by a saint' is the wordplay.
'something' becomes 'boa' (I can't justify this - if you can you should give a lot more credence to this answer).
'worn by' is a charade indicator (letters next to each other).
'a saint' becomes 'st' (abbreviation).
'boa'+'st'='BOAST'

'of' is the link.

Can you help me to learn more?

(Other definitions for boast that I've seen before include "Brag about - squash shot" , "Brag about sabot" , "shot off the side wall" , "Talk with excessive pride" , "Proudly possess" .)

I've seen this clue in The Globe and Mail.
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