Cushioned (6)
'cushioned' is the definition.
(I know that cushioned can be written as padded)
This is the entire clue.
(Other definitions for padded that I've seen before include "Stuffed with soft material" , "Covered with protective material" , "Kind of cell for violent prisoners" , "Covered in soft material" , "Filled with wadding" .)
(Other definitions for spongy that I've seen before include "prepared to absorb" , "Easily squashed" , "Porous, absorbent, soft" , "Absorbing" .)