Crossword Genius

What’s not just immoral monster’s home (9)

Ross

I believe the answer is:

wrongness

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

'what's not just' is the definition.
I can't judge whether this defines the answer.

'immoral monster's home' is the wordplay.
'immoral' becomes 'wrong' (similar in meaning).
'monster's home' becomes 'ness' (I've seen this in another clue).
'wrong'+'ness'='WRONGNESS'

Can you help me to learn more?

I've seen this clue in The Times.
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