Writer's pseudonym (3,4)
I believe the answer is:
pen name
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">writer's pseudonym</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 pen name that I've seen before include "Author's pseudonym" , "Writer's pseudonym" , "Author's alias" , "Nom-de-plume" , "Nom de plume" .)