21 down
PM
expels
head
of
monarchy,
a
rude
sort
(6)
PM expels head of monarchy, a rude sort (6)
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The definition is at the end of the clue.
How the clue works
Look at a rude sort — that's your definition, someone who gawps impolitely. PM Keir STARMER has the head of monarchy (the letter M) expelled from it, and what you're left with is your answer.