Related Clues:

• Start going north, say, reaching ton on A1
• Start making omelettes?
• Start on the nuts?
• See excellent start
• Begin working, and a hint to the starts of 17-, 25-, 35- and 49-Across
• See very fast start
• 'Start, already!'
• Begin in earnest
• Work order?
• Start to understand wizard
• Kick off, feeling pressure under collar
• Set off; take the plunge
• Hop to it ... or what to do to the various eggs in this puzzle's circled squares?
• Begin to understand magic
• “___, cryptologist!”