Acid permitted in shallow pie (7)
I believe the answer is:
tartlet
'shallow pie' is the definition.
The answer and definition can be both things that one consumes for nourishment as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'acid permitted' is the wordplay.
'acid' becomes 'tart' (tart can mean sharp or acid in taste).
'permitted' becomes 'let' (to let something happen is to permit it).
'tart'+'let'='TARTLET'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for tartlet that I've seen before include "Food" , "single pastry" , "fare" , "fruit confection" , "little cake" .)