Fanciful hope (4,5)
I believe the answer is:
pipe dream
'fanciful hope' is the definition.
(I've seen this before)
This is all the clue.
(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" .)