In motion
'in motion' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for astir that I've seen before include "in the land of the living" , "abroad" , "Out of bed or on the move" , "Up and about -- is art (anag)" , "In motion - out of bed" .)
'in motion' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for under way that I've seen before include "In motion (nautical)" , "Might sewer network be" , "coming on" , "In progress" , "Going" .)
(Other definitions for kinetic that I've seen before include "Like a mobile" , "Resulting from motion" , "due to motion" , "(E.g. energy) of motion" , "Caused by motion" .)