Related Clues:

• Little arrow used for insertions
• Input signal?
• Mark for insertion in Building Act to cover engineers
• Manuscript insertion mark
• Mark in the intersection of 19-Across and 11-Down
• "Insert here" symbol
• Ahead of time, be concerned it shows where text is lacking
• Character resembling a hat
• Indicator of omission
• Mark below a line
• Endless fun in tent: magician's beginning to bend small hat
• Shift-6 symbol
• Proofer's pointer
• Editor's addition mark
• "Insert this" symbol