Food drop established in passageway (7)
I believe the answer is:
lasagne
'food' is the definition.
(lasagne is a kind of food)
'drop established in passageway' is the wordplay.
'drop' becomes 'sag' (sagging is a kind of dropping).
'established in' indicates putting letters inside.
'passageway' becomes 'lane' (I can't justify this - if you can you should give a lot more credence to this answer).
'sag' put into 'lane' is 'LASAGNE'.
Can you help me to learn more?
(Other definitions for lasagne that I've seen before include "Type of pasta" , "Fool ran as angel (anag) - pasta dish" , "Course" , "The Italian dish is a gas, Len" , "It. dish of pasta, meat and sauce" .)