Sticky stuff (3)

I think it could be either:

goo

sap

'sticky stuff' is the definition.
(goo is a sticky substance)

This is all the clue.

(Other definitions for goo that I've seen before include "Anything sticky" , "Sticky gunge" , "Slime" , "Sticky substance (colloq.)" , "Sticky substance (sl.)" .)

I've seen this clue in The Times, The Wall Street Journal, The New York Times, the USA Today, the LA Times, the Universal, the Penny Press, The Star Tribune, the King Feature Syndicate, The Mirror and The Guardian.

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