Some time soon (4)
I believe the answer is:
anon
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">some time soon</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for anon that I've seen before include "Without known author" , "Well-published writer" , "Not identified by name" , "Mystery writer" , "Incognito (abbrev)" .)