Speak well of something worn by a saint (5)
I believe the answer is:
boast
'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" .)