11 across
Newton
going,
‘You
shouldn’t
point!’
(3)
Newton going, ‘You shouldn’t point!’ (3)
hints
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hints
The definition is at the end of the clue.
How the clue works
Start with "Newton going" — that's your cue to strip the N (the abbreviation for Newton) out of something. That something is "You shouldn't", which gives you DON'T; knock the N off and you're left with DOT. The definition's point, since a dot is exactly that — a point or full stop.