Fictitious name (9)
I believe the answer is:
pseudonym
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fictitious name</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for pseudonym that I've seen before include "Pen name - use my pond (anag)" , "Lewis Carroll, perhaps?" , "Our cryptic crossword always carries one" , "Name adopted by someone for a particular role" , "in the style of George Eliot?" .)