Quieted (down) (6)
I believe the answer is:
calmed
'quieted down' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for calmed that I've seen before include "Made peaceful, pacified" , "Soothed" , "Placated, made peaceful" , "Made tranquil and quiet" , "relaxed" .)