Walked up and down (5)
I believe the answer is:
paced
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">walked up and down</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for paced that I've seen before include "Walked at a steady speed" , "Walked about in a preoccupied or frustrated way" , "Measured (a distance) by walking" , "Took steps" , "assist an athlete" .)