1. Vegetarian wouldn't want this in a bun (6.4)
Rabbit Meat.I sort of see the word play but surely there is a logical problem here - a clue must take account of meaning and I don't know of any context in which the words 'bun' and 'bunny' are synonymous.
2.Shift Georgia to Gabriel? Almost. (4,6)
Gear change. ie abbreviation of Georgia and archange(l). But the abbreviation of Georgia is GA and not GE!
3. Top gear presenter and kids heard this arrangement (6)
Matrix. but to say 'trix' sounds like kids is a bit of a stretch.
Am I being too pedantic?