Thomas More's ideal state (6)
I believe the answer is:
utopia
'thomas more's ideal state' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for utopia that I've seen before include "Ideal but unattainable state" , "Supposed ideal land" , "Bliss; paradise" , "Idyllic land" , "Thomas More's favourite place" .)