Ancient words of wisdom from Oswald (3,3)

I believe the answer is:

old saw

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'oswald' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'ancient words of wisdom' is the wordplay.
'ancient' becomes 'old' (similar in meaning).
'words of wisdom' becomes 'saw' (I've seen this in another clue).
'old'+'saw'='OLD SAW'

'from' is the link.

Can you help me to learn more?

(Other definitions for old saw that I've seen before include "Proverb" , "that may have lost its cutting edge?" .)

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

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