New town theory is remarkable (10)
I believe the answer is:
noteworthy
'remarkable' is the definition.
(I know that remarkable can be written as noteworthy)
'new town theory' is the wordplay.
'new' is an anagram indicator.
'town'+'theory'='towntheory'
'towntheory' is an anagram of 'NOTEWORTHY'.
'is' acts as a link.
(Other definitions for noteworthy that I've seen before include "Signal" , "Interesting, significant" , "important" , "Of significance" .)