No country about to identify as a place of morbid development (5)
I believe the answer is:
nidus
'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" .)