25 across
Naughty
kid
is
turning
into
fool,
collapsing
inwards
(9)
Naughty kid is turning into fool, collapsing inwards (9)
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The definition is at the end of the clue.
How the clue works
The answer for collapsing inwards is built up in pieces. Start with IMP for the naughty kid, then take "is" and turn it round to get SI, which is dropped inside LOON (a fool) to make LOSION. Putting it all together gives IMPLOSION.