Kelly or Wilder (4)
I believe the answer is:
gene
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">kelly</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">wilder</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(gene wilder)</span><br/ ><br/ ></span>
(Other definitions for gene that I've seen before include "may be passed to child" , "Part of chromosome" , "- - Kelly, dancer" , "Bodily factor controlling heredity" , "Hereditary determinant" .)