Sticky stuff for catching birds in tree (4)

I believe the answer is:

lime

This clue is a double definition.

'sticky stuff for catching birds' is the first definition.

'tree' is the second definition.
(lime is a kind of tree)

'in' acts as a link.

(Other definitions for lime that I've seen before include "Tree, linden or citrus" , "Tree; alkali" , "Sharp-tasting fruit" , "Hang about in Jamaica" , "Another name for the linden tree" .)

I've seen this clue in The Guardian.

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