Possible Clues:

• Twice as old as a man on a gate
• On agate, old man at the double
• From a carol, by the sound of it, the man was twice as old and sitting on most of 9 across
• Twice as old as the man on a gate (4, 4)
• Twice as old as the man on a gate
• The sort of man that was sitting on a gate 94,4)