Crossword Genius

A facet of diamond surplus which is looming in South Africa? (5,8)

Ross

I believe the answer is:

table mountain

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

'south africa?' is the definition.
Both the definition and answer are singular nouns.
Maybe they are linked in a way I don't understand?

'a facet of diamond surplus which is looming in' is the wordplay.
I cannot really understand how this works, but
'a' is present in the answer.
'of' could be 'o' and 'o' is located in the answer.
'in' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for table mountain that I've seen before include "South African landmark" , "It overlooks Cape Town" , "I'm a notable nut (anag) -- Cape Town feature" , "I overlook South African city" , "Flat-topped landmark overlooking Cape Town" .)

I've seen this clue in The Times.
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