Leave ones seat and upsets the dustpan (7)

I believe the answer is:

standup

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'leave ones seat and' is the definition.
I can't tell whether this defines the answer.

'upsets the dustpan' is the wordplay.
'upsets' is an anagram indicator.
'dustpan' with letters rearranged gives 'STANDUP'.

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I've seen this clue in The Irish News.

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