Police taser errs catastrophically (9)

I believe the answer is:

arresters

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'police taser errs catastrophically' is the definition.
I can't tell whether this defines the answer.

'taser errs catastrophically' is the wordplay.
'catastrophically' is an anagram indicator.
'taser'+'errs'='tasererrs'
'tasererrs' with letters rearranged gives 'ARRESTERS'.

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I've seen this clue in The Irish Times.

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