Bitterness, resentment (7)
I believe the answer is:
rancour
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">bitterness</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that bitterness can be written as rancour)</span><br/ ><br/ >'<span class="explanation-format__original">resentment</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that resentment can be written as rancour)</span><br/ ><br/ ></span>
(Other definitions for rancour that I've seen before include "Deep-seated enmity" , "Spiteful ill-feeling" , "Malice" , "Hard feelings" , "Bitterness and ill will" .)