Spongy sweet (11)
I believe the answer is:
marshmallow
'spongy sweet' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for marshmallow that I've seen before include "Spongy jellylike sweet" , "Spongy confection - wild flower" , "Sweet, often toasted" , "Spongy confection - pink-flowering plant" , "sweet little thing" .)