Blow it

I think it could be either:

Which length description are you looking for?:

fail

'blow it' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for fail that I've seen before include "Come to naught" , "Be unable to achieve one's object" , "Don't succeed" , "Be unsuccessful, say in exam" , "Flunk" .)

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

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