6 down
Incline
to
quash
civil
act
by
end
of
day
(9)
Incline to quash civil act by end of day (9)
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The definition is at the beginning of the clue.
How the clue works
Right, so Incline at the start is your definition — it's asking for an upward slope. Now the wordplay: "civil act" gets shuffled about, since "quash" is your anagram indicator, giving you ACCLIVIT. Stick Y on the end, that being the last letter (the "end") of "day", and you've built the whole word.