Staff note (4)
I believe the answer is:
memo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">staff note</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for memo that I've seen before include "Written business message, in short" , "Note written as a reminder" , "A little something to be remembered" , "- Currie, Br. politician" , "Brief note, usually between co-workers" .)