[Everyone] I suggest also that someone provide a "my whole is...." with a more or less cryptic clue. See Tuj's one for Turnham Green (yes, I got it in the end, derr....) which is very much in keeping with traditional riddle-making and kind of rounds the whole off quite nicely.
The first part of my first part's the first part of day The rest of my first is quite heavy to weigh My second you'll see in the sky late at night Whether waxing or waning, an elegant sight.