Crossword Genius

Essential (to) (8)

Ross

I believe the answer is:

integral

(Other definitions for integral that I've seen before include "Entire, whole" , "Fundamental; function" , "whole thing" , "Altering so as to be necessary to the whole" , "Of part necessary to the completeness of a whole" .)

I've seen this clue in the King Feature Syndicate.
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