Elephant and rat swimming in our home (6,5)

I believe the answer is:

planet earth

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

'our home' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'elephant and rat swimming' is the wordplay.
'and' is a charade indicator (letters next to each other).
'swimming' indicates an anagram (letters swim around into a new order).
'elephant'+'rat'='elephantrat'
'elephantrat' is an anagram of 'PLANET EARTH'.

'in' acts as a link.

Can you help me to learn more?

I've seen this clue in The Times.

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