Crossword Genius

Flubber, e.g. (3)

Ross

I believe the answer is:

goo

(Other definitions for goo that I've seen before include "Slime" , "Sticky gunge" , "Sticky wet material or sickly sentiment" , "Sticky substance (sl.)" , "Sticky stuff or sickly sentiment" .)

I've seen this clue in The Wall Street Journal.
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