Nominal inheritance, misguided on my part (8)
I believe the answer is:
patronym
'nominal inheritance' is the definition.
(name inherited from one's father)
'misguided on my part' is the wordplay.
'misguided' indicates anagramming the letters (letters guided into the wrong places).
'on'+'my'+'part'='onmypart'
'onmypart' anagrammed gives 'PATRONYM'.
I've seen this clue in The Times.
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