Marine animal (3,4)
'marine animal' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for sea lion that I've seen before include "Large-eared marine mammal, sometimes performing" , "Marine animal, used as a circus performer" , "Creature" , "Large-eared mammal of Pacific Ocean, like Leo" , "one often immersed in salty water" .)
'marine animal' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for sponge that I've seen before include "Sea animal often found in bathroom" , "that lives in the sea" , "Absorbent marine organism" , "drunkard or > hanger-on" , "Porous mass of fibres found in the ocean" .)