Astir, in progress (5)
I believe the answer is:
afoot
I believe this clue is a double definition.
'astir' is the first definition.
(synonyms)
'in progress' is the second definition.
(I've seen this before)
(Other definitions for afoot that I've seen before include "Going on" , "Stirring" , "Happening" , "Brewing" , "Making progress" .)