Hybrid; mutt (7)
I believe the answer is:
mongrel
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">hybrid</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">mutt</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that mutt can be written as mongrel)</span><br/ ><br/ ></span>
(Other definitions for mongrel that I've seen before include "Dog of mixed breed" , "Cross" , "of mixed blood" , "bastard" , "Dog of no recognisable breed" .)