Related Clues:

• Doctor's order
• E.R. A.S.A.P.
• Message on a work order
• 'ER' command
• Home runs or r.b.i.'s, e.g.
• '...and make it snappy!'
• Rush letters?
• Figure
• Number on a baseball card
• Exec's request
• Team number
• Memo abbr.
• See 51-Down
• 'Make it quick!'
• Express letters