Possible Clues:

• Direct look from a speaker
• Watch scam with discretion - it's capable of bringing the viewers together
• Public speaker's asset, and a phonetic hint to a feature of the starred answers
• I loudly call for sign you're paying attention
• Something to maintain with a speaker
• Nonverbal communication concern, and a phonetic hint to a feature of 16-, 25-, 37-, and 49-Across
• Something that good speakers make with audiences
• Look-locking moment?
• Something to maintain during a conversation
• Peer-to-peer sharing?