Crossword Genius

Truth is the better part of rigour (6)

Ross

I believe the answer is:

verity

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'truth' is the definition.
(I know that truth can be written as verity)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for verity that I've seen before include "Truthfulness" , "Truth - girl's name" , "A lady" .)

I've seen this clue in the Sydney Morning Herald.
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