It's sat on in parts of Africa (4)

I believe the answer is:

sofa

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

'it's sat' is the definition.
I can't tell whether this definition defines the answer.

'in parts of africa' is the wordplay.
'in' indicates the answer is hidden within the clue.
'SOFA' is hidden within 'parts of africa'.

'on' is the link.

Can you help me to learn more?

(Other definitions for sofa that I've seen before include "Couch" , "Divan" , "Wide padded seat" , "Living room seat" , "Long upholstered seat with back and arms" .)

I've seen this clue in the Evening Standard.

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