Memo letters (4)
'memo letters' 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 "Notation meaning with minimum delay" , "Notation or acronym meaning without avoidable delay" , "As soon as possible (abbrev.)" , "Notation-acronym meaning without delay" , "Notation for as quickly as you can" .)
'memo letters' is the definition.
(I've seen this in another clue)
This is all the clue.