Lily-livered person (6)
I believe the answer is:
coward
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">lily-livered person</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know this)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for coward that I've seen before include "Yellow type" , "Person lacking courage" , "Author of 'Blithe Spirit'" , "Blithe Spirit playwright" , "One lacking in courage" .)