Possible Clues:

• "... bombs bursting __"
• Site of 'bombs bursting'
• ''... bombs bursting ___''
• Aloft
• Place for 'bombs bursting'
• "... bombs bursting ___"
• '... bombs bursting __'
• How some popcorn is popped
• “...the bombs bursting ___”
• Words before "Gave proof through the night"