Seaside town bluer than any other, frequently (9)
I believe the answer is:
lowestoft
'seaside town bluer than any' is the definition.
I can't judge whether this definition defines the answer.
'other frequently' is the wordplay.
'other' becomes 'lowest' (I can't justify this - if you can you should give a lot more credence to this answer).
'frequently' becomes 'oft' (oft can mean frequently, eg oft-quoted).
'lowest'+'oft'='LOWESTOFT'
Can you help me to learn more?
(Other definitions for lowestoft that I've seen before include "Suffolk resort" , "fishing port" , "Suffolk town" .)