Possible Clues:

• Not give an inch
• Maintain persistently
• Put your foot down
• 'Maintain this in a sac, by the sound of it (6)'
• Refuse to give in
• Maintain popular sibling without hesitation
• Firmly maintain
• Take a stand at home over little relative beginning to transgress
• Those elected facing first demand
• Stress at home with sibling getting tense