Score of zero (3)
I believe the answer is:
nil
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">score of zero</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for nil that I've seen before include "Nothing, zero" , "duck" , "Zero, zilch" , "Nothing, zilch" , "Lacking value" .)