24 across
Pleased
with
mouse
finally
finding
space
in
forest
(5)
Pleased with mouse finally finding space in forest (5)
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The definition is at the end of the clue.
How the clue works
Right, so space in forest is your definition — that's a glade. For the wordplay, take GLAD meaning "pleased", then tack on the final letter of "mouse" (that's E, "mouse finally"), and you're left with GLADE.