Impractical dreamer
I believe the answer is:
idealist
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">impractical dreamer</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for idealist that I've seen before include "Romantic sort" , "Person with lofty and unselfish aspirations" , "One seeking perfection" , "Utopian" , "Hopeful type" .)