SSC, car driven by Andy Green that broke the sound barrier on land in 1997 (6)

I believe the answer is:

thrust

(Other definitions for thrust that I've seen before include "Force engine generates" , "Sudden push" , "Lunge; propulsive force" , "Push forward as with sword or spear" , "Force used in pushing" .)

I've seen this clue in The Mirror.

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