Memo directive
I believe the answer is:
'memo directive' 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 "As soon as possible (abbrev.)" , "Initials notation meaning with all possible speed" , "Notation-acronym meaning without delay" , "'As quickly as you can, initially (4)'" , "Notation for urgent, quick as you can (4)" .)