Hyde's other self (6)
I believe the answer is:
jekyll
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hyde's other self</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for jekyll that I've seen before include "Doctor with an alter ego" , "The good personality (see 18)" , "Potato heap; immobilise (car)" , "The Strange Case of Dr . . . . . . and Mr Hyde" , "Famous novel 'Dr ...... and Mr Hyde'(6) ()" .)