Crossword Genius

Hippies' food (3)

Ross

I believe the answer is:

pie

I'm a little stuck... Click here to teach me more about this clue!

'food' is the definition.
(pie is a kind of food)

'hippies'' is the wordplay.
'PIE' is hidden in amongst the letters.
However, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for pie that I've seen before include "Confused, mixed type" , "Type of chart" , "Pastry-crust savoury" , "Pecan or blueberry dish?" , "welcome luxury" .)

I've seen this clue in The Mirror.
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