Crossword Genius

No country about to identify as a place of morbid development (5)

Ross

I believe the answer is:

nidus

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

'place of morbid development' is the definition.
The answer and definition can be both states of affairs as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'no country about to identify as a' is the wordplay.
I cannot really see how this works, but
'no' could be 'n' (common abbreviation y/n) and 'n' is found in the answer.
'country' could be 'us' (U.S. is an example) and 'us' is present in the answer.
The remaining letters 'id' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for nidus that I've seen before include "nerve-centre" , "focus of infection" .)

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