Ill-will (7)
I believe the answer is:
rancour
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ill-will</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for rancour that I've seen before include "Deep-seated bitterness" , "Spiteful hostility" , "Feeling of bitterness or dislike" , "generating ill-feeling ..." , "'Bitterness, resentment (7)'" .)