Old party expert runs in to Theodoric's victim (7)

I believe the answer is:

odoacer

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'to theodoric's victim' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'old party expert runs' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'party' becomes 'do' (do is a kind of party).
'expert' becomes 'ace' (ace can informally mean very good).
'runs' becomes 'r' (cricket abbreviation).
'o'+'do'+'ace'+'r'='ODOACER'

'in' is the link.

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

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