Accelerated (4)
I believe the answer is:
sped
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">accelerated</span>' is the definition.<br/ ><span class="explanation-format__explanation">('speed' can be a synonym of 'accelerate')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for sped that I've seen before include "Moved fast" , "Made haste" , "Travelled quickly" , "Moved quickly" , "Went quickly" .)