Briskness (8)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">briskness</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that briskness can be written as alacrity)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for alacrity that I've seen before include "Prompt and eager readiness" , "Brisk and cheerful readiness" , "'Quick, cheerful enthusiasm (8)'" , "Enthusiasm; speed" , "Quickness" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">briskness</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for haste that I've seen before include "''More . . . . ., less speed'' (5)" , "Heats (anag.)" , "velocity" , "Possible cause of careless mistakes?" , "The more of it, the less speed sometimes" .)