An Earnshaw in renovated yacht?

I believe the answer is:

cathy

I'm a little stuck... Click here to teach me more about this clue!

'an earnshaw' is the definition.
I can't tell whether this definition defines the answer.

'renovated yacht?' is the wordplay.
'renovated' indicates an anagram.
'yacht' with letters rearranged gives 'CATHY'.

'in' acts as a link.

Can you help me to learn more?

(Another definition for cathy that I've seen is " girl".)

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