Cheerful readiness (8)
I believe the answer is:
alacrity
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cheerful readiness</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for alacrity that I've seen before include "Enthusiastic speed" , "'Quick, cheerful enthusiasm (8)'" , "Prompt enthusiasm" , "Prompt readiness and briskness" , "Prompt and eager readiness" .)