Ideal state (6)
I believe the answer is:
utopia
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ideal state</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for utopia that I've seen before include "impossible to find" , "Perfect state of things" , "Imagined state of perfection" , "Thomas More's favourite place" , "Impracticable state of perfection" .)