Letters of urgency (4)

I think it could be either:

Which length description are you looking for?:

asap

'letters of urgency' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for asap that I've seen before include "At one's earliest convenience" , "Notation meaning with minimum delay" , "Common acronym for quick-as-you-can" , "Notation meaning without delay, fast as you can" , "'At the earliest moment, initially (4)'" .)

I've seen this clue in The Mirror, the Newsday, the LA Times and The Wall Street Journal.

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