Crossword Genius

Mansion rebuilt for personal pleasure (7)

Ross

I believe the answer is:

onanism

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

'personal pleasure' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'mansion rebuilt' is the wordplay.
'rebuilt' indicates anagramming the letters.
'mansion' is an anagram of 'ONANISM'.

'for' is the link.

Can you help me to learn more?

(Another definition for onanism that I've seen is " seedy practice".)

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