Hissing sound that's alarming we hear build (8)

I believe the answer is:

physique

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'build' is the definition.
(I know that build can be written as physique)

I can't explain the remainder of the clue.

(Other definitions for physique that I've seen before include "Shape and size of a person's body" , "Bodily type, build, or constitution" , "Person's build and muscular development" , "Constitution of the human body" , "Form" .)

I've seen this clue in The Times.

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