7 across
Edges
of
empire
sacked
by
Egypt’s
last
queen
(9)
Edges of empire sacked by Egypt’s last queen (9)
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The definition is at the beginning of the clue.
How the clue works
Look at Edges — that's your definition, the boundary of a shape. Take an anagram of EMPIRE (the "sacked" signal does the work there) to get PERIME, then tack on T (the last letter of Egypt) and ER (queen) at the end.