17 down
Sharon,
say,
is
PM,
losing
head
(7)
Sharon, say, is PM, losing head (7)
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The definition is at the beginning of the clue.
How the clue works
The wordplay points to a PM (Benjamin Disraeli) losing head, so we drop the first letter of DISRAELI to get ISRAELI. The definition Sharon, say refers to Ariel Sharon as an example of an Israeli.