Crossword Genius

Run out of breath (6)

Ross

I believe the answer is:

expire

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'run' is the definition.
(thesaurus)

'out of breath?' is the wordplay.
'out of' becomes 'ex' ('out of' in Latin).
'breath?' becomes 'pire' (I can't justify this - if you can you should believe this answer much more).
'ex'+'pire'='EXPIRE'

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(Other definitions for expire that I've seen before include "Die or terminate" , "Die, give out" , "Lose validity" , "Come to an end; die" , "Die or go out of date" .)

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