Related Clues:

• Common subject?
• It's not always proper
• Pickup line request
• Speak with one's hands
• Ampersand, for one
• Aries, for one
• Complete a contract
• Seal the deal
• Sir or madam
• Horoscope datum
• Sentence subject, usually
• It may be abstract
• Word before a verb, maybe
• Apply one's John Hancock
• This answer is one