Crossword Genius

Thick substance (3)

Ross

I believe the answer is:

goo

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

I've seen this clue in the Penny Press and The Telegraph.
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