1) Cacodemon 2) Caesarean dozen 3) Cardinal 4) Clock marking 5) Clock number 6) Clock-dial number 7) Clock-topping letters 8) Dozen 9) Duodecim 10) Face-topping figure 11) Highest clock number 12) Highest number on a sundial 13) Highest number on clocks 14) Highest sundial numeral 15) Hour on a clock Found on https://www.crosswordclues.com/clue/xii