Crossword Genius

Quick learner (6)

Ross

I believe the answer is:

sponge

'quick learner' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for sponge that I've seen before include "Cadge; type of cake" , "Porous mass for wiping up" , "Sea animal often found in bathroom" , "that lives in the sea" , "Sea creature - cleanser - cake" .)

I've seen this clue in The New York Times.
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