Car safety feature (8)

I think it could be either:

Which length description are you looking for?:

4,4

seat belt

'car safety feature' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for seat belt that I've seen before include "Safety strap in car - must wear it" , "Safety device in car - wearing mandatory" , "Safety device worn in car" , "Safety strap worn in car" , "became mandatory ..." .)

I've seen this clue in The Sun.

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