Excessively modern England few regulated (10)
I believe the answer is:
newfangled
'excessively modern' is the definition.
(I've seen this before)
'england few regulated' is the wordplay.
'regulated' indicates an anagram.
'england'+'few'='englandfew'
'englandfew' is an anagram of 'NEWFANGLED'.
(Other definitions for newfangled that I've seen before include "Recent" , "Excessively modern" , "Modern and familiar" , "like nothing seen before" , "Freshly developed and unfamiliar" .)