Well loved hollow tree (6)

I believe the answer is:

poplar

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'tree' is the definition.
(poplar is a kind of tree)

I can't explain the remainder of the clue.

(Other definitions for poplar that I've seen before include "part of London" , "Deciduous tree" , "Tree as tulip-tree, aspen" , "tree found mostly in the northern hemisphere" , "Slender tree with quivering leaves" .)

I've seen this clue in the Sydney Morning Herald.

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