Short letters (5)
I believe the answer is:
notes
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">short letters</span>' is the definition.<br/ ><span class="explanation-format__explanation">('note' can be a synonym of 'short letter')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for notes that I've seen before include "Short written messages" , "Sees" , "Memos; marks" , "Sounds" , "Memoranda" .)