22 down
Leaders
of
private
schools
start
to
pay
attention
(4)
Leaders of private schools start to pay attention (4)
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The definition is at the end of the clue.
How the clue works
Look at pay attention — that's your definition, since PSST is the interjection you'd hiss at someone to catch their eye. The wordplay asks you to take the leading letters of Private Schools Start To, which gives you P, S, S, T.