Crossword Genius

Ground rent depression? (6)

Ross

I believe the answer is:

crater

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

This might be a double definition.

'ground rent' is the first definition.
The answer and definition can be both natural objects as well as being singular nouns.
Perhaps you can see a link between them that I don't see?

'depression?' is the second definition.
(I know that crater is a type of depression)

Can you help me to learn more?

(Other definitions for crater that I've seen before include "Bowl-shaped cavity, in a volcano say" , "Lunar surface dent" , "Volcano's mouth" , "Geological depression" , "Hole of volcano or bomb" .)

I've seen this clue in The Globe and Mail.
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