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One must be quick to do so (7)


I believe the answer is:


I'm a little stuck... Click here to teach me more about this clue!

'one must be' is the definition.
'breathe' can be an answer for 'be' (thesaurus). I'm unsure of the 'one must' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for breathe that I've seen before include "Expel gas" , "Respire - inspire - expire" , "Take into mouth" , "wheeze" , "Tell" .)

I've seen this clue in The Globe and Mail.
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