Crossword Genius

Stop round breathing space during descent (9)

Ross

I believe the answer is:

forestall

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

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for forestall that I've seen before include "Avert" , "Arrive first" , "Anticipate" , "Hinder by anticipation" , "Obstruct by taking advance action" .)

I've seen this clue in the Sydney Morning Herald.
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