Lies told in Melton Mowbray? (4,4)
I believe the answer is:
pork pies
'melton mowbray?' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'lies told in' is the wordplay.
'lies' becomes 'porkies' (rhyming slang - porky pies).
'told' becomes 'p' (I am not sure about this - if you are sure you should believe this answer much more).
'in' is an insertion indicator.
'porkies' placed around 'p' is 'PORK-PIES'.
Can you help me to learn more?
(Another definition for pork pies that I've seen is " Food - hats - falsehoods".)