Impractical person (8)
I believe the answer is:
idealist
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">impractical person</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for idealist that I've seen before include "An optimist or romantic" , "One who aspires to perfect standards" , "One who aims for perfection, may be unrealistic" , "One who pursues the perfect" , "philosopher" .)