Related Clues:

• Stay at home for the demonstration
• Protest on the floor
• Substitute reputation cut short
• Nearly suffering as a substitute
• Stay upright in a sub?
• Status detailed for substitute
• Understudy is nearly permanent
• Attach note about husband being substitute for striker
• Industrial action
• Intervene dramatically, or at a senior level
• Go to bat (for)
• A kind of protest
• Do more than listen
• Substitute performer
• Type of college protest