Crossword Genius

Essential person or thing (8)

Ross

I believe the answer is:

linchpin

(Other definitions for linchpin that I've seen before include "Essential person - keeps wheel in position" , "The part which holds a wheel on its axle" , "Indispensable person or thing (I, not Y)" , "key individual" , "Central cohesive source of support and stability" .)

I've seen this clue in The Mirror.
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