Right away, in a memo (4)
I believe the answer is:
asap
'right away in a memo' 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 "'As quickly as you can, initially (4)'" , "As soon as you can, initially" , "Notation for as quickly as you can" , "As soon as possible (abbrev.)" , "'At the earliest moment, initially (4)'" .)