City no longer a noted centre of potteries (6)
I believe the answer is:
exeter
'city' is the definition.
(exeter is a city)
'no longer a noted centre of potteries' is the wordplay.
'no longer' becomes 'ex' (prefix meaning former or onetime).
'a noted' becomes 'e' (I can't explain this - if you can you should believe this answer much more).
'centre of' says to take the centre.
The central letters of 'potteries' are 'ter'.
'ex'+'e'+'ter'='EXETER'
Can you help me to learn more?
(Other definitions for exeter that I've seen before include "City in 5 Down" , "South-western English city" , "County town and cathedral city of Devon" , "One making an advance" , "English university city" .)