Crossword Genius

Built-in (8)

Ross

I believe the answer is:

integral

'built-in' is the definition.
(I know that built-in can be written as integral)

This is all the clue.

(Other definitions for integral that I've seen before include "Necessary as part of a whole, like triangle" , "Maths function; whole" , "Built-in -- 1 across (anag)" , "Forming part of the whole" , "Triangle being essential" .)

I've seen this clue in The Star Tribune and the Sydney Morning Herald.
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