Jump, vault (4)
I believe the answer is:
leap
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">jump</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that jump can be written as leap)</span><br/ ><br/ >'<span class="explanation-format__original">vault</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for leap that I've seen before include "Jump a long way" , "'Look before you . . . .'" , "Jump across" , "Basket" , "as 1984 was" .)