23a. Banger slice eaten by someone foolish (6) - JALOPY (Banger) fits the definition. I think it's 'Slice' = LOP, 'eaten' or surrounded by JAY, but I can't find any source that gives Jay as 'Someone foolish' - what have I missed?
jay
dʒeɪ/Submit
noun
1.
a bird of the crow family with boldly patterned plumage, typically having blue feathers in the wings or tail.
2.
informaldated
a person who talks at length in a foolish or impertinent way.