Type of cake (6)
I believe the answer is:
sponge
'type of cake' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for sponge that I've seen before include "Marine creature - cadge" , "Parasite" , "Marine animal with ability as at 3 Down" , "Sea creature - cleanser - cake" , "Animal that absorbs liquid" .)