Happening, in train (5)

I believe the answer is:
afoot
(Other definitions for afoot that I've seen before include "Happening" , "In the pipeline" , "Brewing" , "in preparation" , "in the air" .)
I believe the answer is:
afoot
(Other definitions for afoot that I've seen before include "Happening" , "In the pipeline" , "Brewing" , "in preparation" , "in the air" .)