Fierceness (8)
I believe the answer is:
ferocity
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fierceness</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that fierceness can be written as ferocity)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for ferocity that I've seen before include "Unrestrained and cruel savagery" , "State of savagery and violence" , "Wild savagery" , "Savage cruelty of temperament" , "Savageness" .)