Astir (5)
I believe the answer is:
afoot
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">astir</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for afoot that I've seen before include "Happening" , "in preparation" , "Stirring" , "In the wind" , "In the pipeline" .)