Related Clues:

• Stiffen
• Use it to prevent run-on, perhaps
• Pause cause
• Predicate part
• Not cool at all
• Sir or madam
• English class topic
• Sentence subject, usually
• It may be abstract
• Emotionally charged
• Walking on eggshells
• Word before a verb, maybe
• Like a tie game in overtime
• Suspenseful
• This answer is one