
1) Dessert in orbit 2) Empty promise 3) Half-baked utopia 4) Heavenly reward 5) Heavenly Spanish foot 6) High hopes 7) Illusory promise 8) Illusory prospect of profit 9) Impractical prospect 10) Perfect happiness 11) Phantasmagoric 12) Promise of a future reward 13) Unrealistic goal
Found on
https://www.crosswordclues.com/clue/pie-in-the-sky

Pie in the sky is American tramp slang for Ones reward in the hereafter.
Found on
http://www.probertencyclopaedia.com/browse/ZP.HTM
No exact match found.