Related Clues:

• Have to have a start to gather that it leads to 'er
• Summon this hundred and everyone else
• "Safe!" or "Out!"
• Try to find on the road, say
• Umpire's ruling
• Summon with a sign
• ___ and response ('human microphone' technique at Occupy Wall Street)
• Word with "role" or "house"
• Call on an intercom, as a doctor
• Thing often dropped in a tunnel
• Arouse, as feelings
• One side of a leaf?
• Part of a magazine
• Mention in a footnote
• Be an umpire