Slinky mate replaced in error (10)
I believe the answer is:
mistakenly
'in error' is the definition.
(I've seen this before)
'slinky mate replaced' is the wordplay.
'replaced' indicates anagramming the letters.
'slinky'+'mate'='slinkymate'
'slinkymate' with letters rearranged gives 'MISTAKENLY'.
(Another definition for mistakenly that I've seen is " in error".)
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