Messy stuff (3)

I think it could be either:

Which length description are you looking for?:

goo

'messy stuff' is the definition.
(I've seen this in another clue)

This is all the clue.

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

I've seen this clue in the Penny Press.

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