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 Mirror, The Guardian, The Times, the LA Times, the King Feature Syndicate, The Wall Street Journal, the USA Today, the Universal, The Star Tribune and The New York Times.

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