Potty war involved this political system (3-5)

I believe the answer is:

two-party

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'political system' is the definition.
The definition and answer are not the same part of speech.

'potty war involved' is the wordplay.
'involved' indicates an anagram (involved can mean confusing or complex).
'potty'+'war'='pottywar'
'pottywar' with letters rearranged gives 'TWO-PARTY'.

'this' is the link.

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I've seen this clue in The Independent.

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