Food item to munch with slice of bread in plaza (8)
I believe the answer is:
meatball
'food item' is the definition.
(I've seen this before)
'munch with slice of bread in plaza' is the wordplay.
'munch' becomes 'eat' (I've seen this in another clue).
'with' means one lot of letters go next to another.
'slice of bread' becomes 'b' (I can't justify this - if you can you should give a lot more credence to this answer).
'in' indicates putting letters inside.
'plaza' becomes 'mall' (synonyms).
'eat'+'b'='eatb'
'eatb' placed into 'mall' is 'MEATBALL'.
'to' is the link.
Can you help me to learn more?
(Other definitions for meatball that I've seen before include "Food made from minced beef" , "minced beef, say" , "Item in the Greek dish keftedes" , "Dull American" , "portion of food" .)