Buoyancy aid (4,6)

I think it could be either:

Which length description are you looking for?:

4,6

life jacket

'buoyancy aid' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for life jacket that I've seen before include "Flotation garment" , "Mae West" , "protective coat" , "Cover on biography" , "Buoyant belt" .)

I've seen this clue in The Mirror and The Guardian.

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