See furniture go down then plateau (9)

I believe the answer is:

tableland

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'plateau' is the definition.
(synonyms)

'see furniture go down' is the wordplay.
'see furniture' becomes 'table' (table is a kind of furniture).
'go down' becomes 'land' (synonyms. I am not sure about the 'go' bit.).
'table'+'land'='TABLELAND'

'then' is the link.

Can you help me to learn more?

(Other definitions for tableland that I've seen before include "Elevated area" , "Broad high plateau" .)

I've seen this clue in the Sydney Morning Herald.

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