The London Eye? (5)
'the london eye?' is the definition.
(Cockney rhyming slang for 'eye' is mince pie)
This is the entire clue.
(Other definitions for mince that I've seen before include "processed meat?" , "Cut meat into small pieces, or walk affectedly" , "Grind up (meat)" , "Simper" , "Shred (meat)" .)
(Other definitions for mince pie that I've seen before include "Christmas pastry" , "Christmas treat" , "festive treats" , "Fruit-filled tart" , "Christmas food item" .)