Related Clues:

• If you send this up, watch it, perhaps
• Just watch how this may be a send-up
• Watch how you send up for this
• Send back the clock?
• An old one might be an antique clock
• Watch this and send it back
• Watch this. Send it back
• 'Re this, say no and be blowed for it (4)'
• Hourglass, e.g
• Proctor's need
• Clock or watch
• Settle up for a clocklike device
• Row about origin of metrical chronometer
• Electrical safety device for explosive lighter
• Watch this! Married in the middle of a row!