Crossword Genius

Dark goo (3)

Ross

I believe the answer is:

tar

'dark goo' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for tar that I've seen before include "Sticky black stuff" , "Thick flammable liquid" , "Informal sailor or coal distillation" , "Informal sailor, the rat" , "Black substance, used on roads" .)

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