Superfluously tend laundry mangles (11)

I believe the answer is:

redundantly

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'superfluously' is the definition.
Both the answer and definition are adverbs.
Maybe there's a link between them I don't understand?

'tend laundry mangles' is the wordplay.
'mangles' indicates anagramming the letters (I've seen 'mangled' mean this).
'tend'+'laundry'='tendlaundry'
'tendlaundry' is an anagram of 'REDUNDANTLY'.

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

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