Hippies' food (3)

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 within the letters.
However, I'm unsure how the hidden word 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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