Average clients upset trip organisers (6,8)

I believe the answer is:

travel agencies

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'trip organisers' is the definition.
I can't tell whether this defines the answer.

'average clients upset' is the wordplay.
'upset' indicates an anagram.
'average'+'clients'='averageclients'
'averageclients' anagrammed gives 'TRAVEL AGENCIES'.

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

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