Flog out-of-state rivalries (9)

I believe the answer is:

vendettas

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'rivalries' is the definition.
The definition and answer can be both acts as well as being plural nouns.
Maybe you can see an association between them that I can't see?

'flog out-of-state' is the wordplay.
'flog out' becomes 'vend' (I am not sure about this - if you are sure you should believe this answer much more).
'of' indicates an anagram (the answer comes from or 'of' the letters).
'state' with letters rearranged gives 'ettas'.
'vend'+'ettas'='VENDETTAS'

Can you help me to learn more?

(Another definition for vendettas that I've seen is " No end of spite here".)

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

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