Unusually rich patois capable of creating proverbs (10)

I believe the answer is:

aphoristic

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'capable of creating proverbs' is the definition.
I can't judge whether this defines the answer.

'unusually rich patois' is the wordplay.
'unusually' is an anagram indicator.
'rich'+'patois'='richpatois'
'richpatois' with letters rearranged gives 'APHORISTIC'.

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(Another definition for aphoristic that I've seen is " Like a saw".)

I've seen this clue in The Irish Times.

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