Crossword Genius

Fundamental principle (5)

Ross

I believe the answer is:

basis

'fundamental principle' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for basis that I've seen before include "First principle" , "grounds" , "Ground, foundation" , "Reason" , "Underlying support (for an idea)" .)

I've seen this clue in the Jonesin', The Washington Post Sunday, the USA Today, The Sun, the Family Time, the Wall Street Journal, The Independent and The Guardian.
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