"ASAP!” (6)

I think it could be either:

Which length description are you looking for?:

pronto

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

This is all the clue.

(Other definitions for pronto that I've seen before include "Quickly, amigo" , "Italian telephonic greeting" , "Quickly (sl.)" , "Proton (anag.)" , "Right now, immediately" .)

I've seen this clue in The Wall Street Journal and The Guardian.

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