At the earliest chance (4)

I believe the answer is:

asap

(Other definitions for asap that I've seen before include "Notation for urgent, quick as you can (4)" , "Notation meaning with minimum delay" , "Initials notation meaning with all possible speed" , "At the earliest opportunity (abbrev.)" , "Common acronym for quick-as-you-can" .)

I've seen this clue in The New York Times.

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