Crossword Genius

Principle of reversibility? (5)

Ross

I believe the answer is:

tenet

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This clue could be a double definition.

'principle' is the first definition.
(I've seen this before)

'reversibility?' is the second definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for tenet that I've seen before include "Key principle" , "Article of belief" , "Article of faith; doctrine" , "Canon" , "That's the law" .)

I've seen this clue in The Mirror.
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