Three score and ten (7)
I believe the answer is:
seventy
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">three score and ten</span>' is the definition.<br/ ><span class="explanation-format__explanation">(score can mean twenty)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for seventy that I've seen before include "Threescore and ten" , "Three score years and ten" , "A number" , "LXX" .)