Crossword Genius

Crashed down? All in flat, depressed region ... (7)

Ross

I believe the answer is:

lowland

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'flat depressed region' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'crashed down? all' is the wordplay.
'crashed' indicates anagramming the letters.
'down'+'all'='downall'
'downall' with letters rearranged gives 'LOWLAND'.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for lowland that I've seen before include "Region not as high as other areas" , "Terrain of little altitude" , "No high countryside" , "Area with no high points" , "The Fens, perhaps" .)

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