Leave results causing problem at the highest level (9)

I believe the answer is:

splitends

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'problem at the highest level' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'leave results' is the wordplay.
'leave' becomes 'split' (I've seen this before).
'results' becomes 'ends' (I've seen this in another clue).
'split'+'ends'='SPLITENDS'

'causing' acts as a link.

Can you help me to learn more?

I've seen this clue in The Daily Express.

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