Office acronym (4)
I believe the answer is:
asap
'office acronym' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for asap that I've seen before include "yesterday?" , "Notation for as quickly as you can" , "Notation meaning without delay, treat as urgent" , "Notation meaning without delay, fast as you can" , "'At the earliest moment, initially (4)'" .)