Settled (down) (6)
I believe the answer is:
calmed
'settled down' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for calmed that I've seen before include "Made tranquil and quiet" , "Pacified, dispelled anger" , "Made peaceful, pacified" , "relaxed" , "Placated, made peaceful" .)