Board comes down in high areas (10)

I believe the answer is:

tablelands

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'high areas' is the definition.
Although both the answer and definition are plural nouns, I don't understand how they can define each other.

'board comes down' is the wordplay.
'board' becomes 'table' (both can mean food).
'comes down' becomes 'lands' (I've seen this in another clue).
'table'+'lands'='TABLELANDS'

'in' is the link.

Can you help me to learn more?

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

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