Crossword Genius

Triangle turned out to be fundamental (8)

Ross

I believe the answer is:

integral

'to be fundamental' is the definition.
(I've seen this before)

'triangle turned' is the wordplay.
'turned' is an anagram indicator.
'triangle' anagrammed gives 'INTEGRAL'.

'out' acts as a link.

(Other definitions for integral that I've seen before include "Maths function; whole" , "Belonging as an essential part" , "form whole" , "Forming part of the whole" , "Triangle (anag)" .)

I've seen this clue in The Mirror.
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