Crossword Genius

Ground rent at high level? (8)

Ross

I believe the answer is:

crevasse

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

'ground rent' is the definition.
'crevasse' can be an answer for 'rent' (thesaurus). I'm not sure about the 'ground' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for crevasse that I've seen before include "opening" , "big split" , "Deep glacial fissure" , "climbing hazard in glacier" , "Deep glacial crack" .)

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