Calm, appease (7)
I believe the answer is:
placate
I believe this clue is a double definition.
'calm' is the first definition.
(placating is a kind of calming)
'appease' is the second definition.
(I know that appease can be written as placate)
(Other definitions for placate that I've seen before include "Mollify, calm down" , "Mollify, appease" , "Pale cat could pacify" , "Mollify, soothe anger" , "Make calm, conciliate" .)