The answers all relate to weights, measures (old and new), amounts, quantities or sizes.
1) An actress who earns liquid money? (4,9)
2) Sounds like breezy Celtic police (4,5)
3) What numerate bees produce (3,6,5)
4) Anyone's guess (3,4,2,1,5,2,6)
5) Small meals still lead to eggs (11)
6) A disco for muffins? (9)