From your compiler, second note (4)
I believe the answer is:
memo
'note' is the definition.
(I know that memo is a type of note)
'from your compiler second' is the wordplay.
I cannot quite understand how this works, but
'from' could be 'o' (I've seen this in other clues) and 'o' is present in the answer.
'compiler' could be 'me' (the person who is writing these clues) and 'me' is located in the answer.
A single letter 'm' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for memo that I've seen before include "Businesslike message" , "Note written as a reminder" , "Written business message, in short" , "- Currie, Br. politician" , "A brief record of events" .)