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" .)

I've seen this clue in The Mirror and the Evening Standard.

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