"I need it now!" letters (4)

I believe the answer is:

asap

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

I've seen this clue in the Family Time and the LA Times.

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