Sees candidate's unusual legal request (5,3,6)

I believe the answer is:

cease and desist

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'legal request' is the definition.
The definition suggests a singular noun which matches the answer.

'sees candidate's unusual' is the wordplay.
'unusual' indicates an anagram.
'sees'+'candidates'='seescandidates'
'seescandidates' is an anagram of 'CEASE AND DESIST'.

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

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