December over, Mr Simpson set about furnishing for the house (4,5)

I believe the answer is:

home decor

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'december over mr simpson set' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'furnishing for the house' is the wordplay.
'furnishing' becomes 'decor' (I've seen this in another clue).
'for' means one lot of letters go next to another (I've seen this in other clues).
'the house' becomes 'home' (I've seen this before).
'decor' put after 'home' is 'HOME DECOR'.

'about' acts as a link.

Can you help me to learn more?

I've seen this clue in The Independent.

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