4 down
Disapproval
is
following
involuntary
response
in
a
lot
of
bad
behaviour
(9)
Disapproval is following involuntary response in a lot of bad behaviour (9)
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The definition is at the beginning of the clue.
How the clue works
The definition is Disapproval, which is exactly what criticism expresses. For the wordplay, take CRIME ("bad behaviour") and lop off its last letter ("a lot of" it) to leave CRIM. Then slot TIC ("involuntary response") followed by IS inside that, so you get CRI, then TIC, then IS, then M.