She gets Leo upset about Diana (5)

I believe the answer is:

odile

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'diana' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'she gets leo upset' is the wordplay.
'she' becomes 'di' ().
'gets' indicates putting letters inside.
'upset' indicates anagramming the letters.
'leo' is an anagram of 'ole'.
'di' inserted into 'ole' is 'ODILE'.

'about' acts as a link.

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