Related Clues:

• 200 milligrams
• At bats, e.g.
• Diamond weight
• Corset part
• 'Immediately!'
• Copy of a photo, briefly
• Immediately, in the E.R.
• Like some diamonds, sizewise
• 200 milligrams, to a jeweler
• 'Now!'
• Common opening time
• This puzzle's theme
• On the double
• Without delay
• R.B.I., e.g.