Get out of breath being no longer fit (6)

I believe the answer is:

exhale

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'get out of breath' is the definition.
I can't judge whether this definition defines the answer.

'no longer fit' is the wordplay.
'no longer' becomes 'ex' (prefix meaning former or onetime).
'fit' becomes 'hale' (both can mean healthy).
'ex'+'hale'='EXHALE'

'being' acts as a link.

Can you help me to learn more?

(Other definitions for exhale that I've seen before include "expire" , "Joint of chicken" , "Discharge" , "Expel air from the lungs" , "let breath out" .)

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

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