Hippies' tart (3)
I believe the answer is:
pie
'tart' is the definition.
(both are baked goods)
'hippies'' is the wordplay.
'PIE' is hidden in amongst the letters.
But, I'm not sure how the hidden word is indicated.
Can you help me to learn more?
(Other definitions for pie that I've seen before include "In the sky, it's an unrealistic prospect" , "Filled pastry" , "Pastry-crust savoury" , "where blackbirds sang" , "Fruit or meat dish" .)