Reassure (4)
I believe the answer is:
calm
(Other definitions for calm that I've seen before include "'Tranquil, placid (4)'" , "Pacific" , "Composure or serenity" , "Self-possessed" , "Imperturbable, soothe" .)
I believe the answer is:
calm
(Other definitions for calm that I've seen before include "'Tranquil, placid (4)'" , "Pacific" , "Composure or serenity" , "Self-possessed" , "Imperturbable, soothe" .)