Chancellor of the Exchequer shoring up Johnson Sr's position (6)

I believe the answer is:

stance

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'position' is the definition.
(stance is a kind of position)

I can't explain the rest of the clue.

(Other definitions for stance that I've seen before include "Upright posture" , "Position assumed by upright person" , "Position, viewpoint" , "Attitude or way of standing" , "Deportment" .)

I've seen this clue in The Independent.

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