Jumps on one foot (4)
I believe the answer is:
hops
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">jumps on one foot</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for hops that I've seen before include "Leaps on one leg" , "Shop around for beer material" , "(Little) jumps" , "Dances -- beer ingredient" , "what could make you bitter" .)