Crossword Genius

Overturning Istanbul's leader! (4,4,6)

Ross

I believe the answer is:

head over turkey

I'm a little stuck... Click here to teach me more about this clue!

'overturning istanbul's' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'leader' is the wordplay.
I cannot really see how this works, but
'leader' could be 'head' (head is a kind of leader) and 'head' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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