Used litany unconventionally, in an erratic fashion (10)

I believe the answer is:

unsteadily

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'in an erratic fashion' is the definition.
I can't tell whether this definition defines the answer.

'used litany unconventionally' is the wordplay.
'unconventionally' indicates an anagram.
'used'+'litany'='usedlitany'
'usedlitany' is an anagram of 'UNSTEADILY'.

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I've seen this clue in The Guardian.

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