Fanciful hope (4,5)
I believe the answer is:
pipe dream
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fanciful hope</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 pipe dream that I've seen before include ""Pie in the sky"" , "Unattainable hope" , "Fanciful hope" , "castle in Spain?" , "Fanciful or impossible plan" .)