29 down
Plane
possibly
needs
way
to
ditch
wings
(4)
Plane possibly needs way to ditch wings (4)
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The definition is at the beginning of the clue.
How the clue works
Plane possibly is your definition, since a plane is of course a type of tree. For the wordplay, take STREET (way) and ditch wings — that is, lop off the first and last letters — and you're left with your answer.