Crossword Genius

Pillar, backbone (8)

Ross

I believe the answer is:

mainstay

I believe this clue is a double definition.

'pillar' is the first definition.
(I know this)

'backbone' is the second definition.
(I know this)

(Other definitions for mainstay that I've seen before include "Pillar of strength" , "big support" , "Chief source of support" , "Linchpin, principle support" , "Rope to the mast is the chief support" .)

I've seen this clue in The Mirror.
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