Very soft mattress (7,3)
(Other definitions for feather bed that I've seen before include "Pamper" , "cushion" , "Provide with extremely favourable conditions" , "Provide incentive" , "Type of mattress" .)
(Other definitions for featherbed that I've seen before include "Take great care to protect" , "Pamper" , "Subsidise" , "mattress" .)