Related Clues:

• Service call?
• Barber's shout
• Leading the queue
• Queue call
• Immediately after
• Call to a queue
• Word to keep the line moving
• Call to the head of the line?
• Barber shop call
• Queue cue
• At some point
• Counter call
• Call at a deli
• What one at the head of a line likes to hear
• Adjacent