A Cockney (9)
I believe the answer is:
eastender
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">a cockney</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 eastender that I've seen before include "Butcher perhaps" , "Capital fellow" , "eg Barbara Windsor" , "Pearly Queen surely is" , "Cockney" .)