Four score (6)
I believe the answer is:
eighty
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">four score</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 eighty that I've seen before include "XXC" , "Cardinal" , "not many score" , "Around the World in - Days (Verne)" , "Number" .)