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Explicit
case
of
wood
in
tree
(5)
Explicit case of wood in tree (5)
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The definition is at the beginning of the clue.
How the clue works
The definition is Explicit — something risqué or coarse. Take BAY, which is a type of tree, then slot in the outer letters of "wood" (that's WD, the "case of wood") to get BA-WD-Y.