New growth a nuisance in capital (8)
I believe the answer is:
budapest
'capital' is the definition.
(capital of Hungary)
'new growth a nuisance' is the wordplay.
'new growth' becomes 'buda' (I can't explain this - if you can you should believe this answer much more).
'a nuisance' becomes 'pest' (I've seen this before).
'buda'+'pest'='BUDAPEST'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for budapest that I've seen before include "Capital city on the Danube" , "Hungary's capital" , "capital location" , "European capital" , "Capital of Hungary" .)