Bad blood (6)
I believe the answer is:
enmity
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bad blood</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 enmity that I've seen before include "Animus" , "Bad blood" , "Hatred, hostility" , "Hostility, ill-will" , "Personal hostility" .)