7 down
Tool
with
key
finally
locked
in
dilapidated
chest
(6)
Tool with key finally locked in dilapidated chest (6)
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The definition is at the beginning of the clue.
How the clue works
Right, so Tool is your definition there - a scythe's the cutting tool. For the wordplay, you take "key finally" which just means the last letter, Y, and shove that inside an anagram (that's your "dilapidated" doing the anagram work) of CHEST - jumble those letters up around the Y and you land on SCYTHE.