Core features of modern car technology (3)

I believe the answer is:

abs

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'core features' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

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(Other definitions for abs that I've seen before include "Exercise to improve these" , "Stomach muscles (abbr)" , "ratings?" , "Some musculature" , "stopping system" .)

I've seen this clue in The Times.

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