Answer: xii

AnswerCrossword Clue
XIITop numeral on many a grandfather clock
XIIIt's at the top of many a round face
XIISundial numeral
XIILunchtime, on a sundial
XIIMidnight, on a grandfather clock
XIISundial topper
XIIWitching hour
XIIGrandfather clock number
XIIHour on a clock face
XIIWitching hour on a grandfather clock
XIITop of the hour?
XIIIt may be seen opposite VI
XIINumber at the top of a grandfather clock
XIINoon, on a sundial
XIILargest number on a sundial
XIISundial hour
XIINumber on a dial
XIITwice VI
XIIClock number
XIIMidnight indicator, maybe
XIIThe witching hour
XIICaligula's dozen
XIIIII x IV
XIIIt may atop a clock
XIIHigh on Big Ben
XIITop of the hour in Rome?
XIIMidnight in Old Rome
XIINoon for Nero
XIINoon on some clocks
XIINoon on a sundial
XIIOvid's dozen
XIISundial figure
XIILivy's lunch hour?
XIIN : compass :: .. : clock
XIICaesar's dozen
XIIFirst Super Bowl played in prime time
XIISundial number
XIIIt may be to the left of an "I"
XIINoon indicator
XIIIV tripled