Crossword Genius

Professor's most important fundamental truth (9)

Ross

I believe the answer is:

principle

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Here is my best explanation:

'fundamental truth' is the definition.

(I've seen this before)

I cannot understand how the remainder of the clue works.

This clue was last seen in The Independent

(Other definitions for principle that I've seen before include "honour", "General scientific law", "Basic standard", "Basic truth, law or assumption", "General guiding rule", "Personal rule of conduct", "Axiom", "Set of rules", "Tenet" and "Law of nature, rule of conduct".)

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