Possible Clues:

• Hold out for the break one's put in for
• Put up opposition to sister
• Don't give in what is included among all the others
• Don't give in what's in what's left
• One is among the rest that won't give in
• Do not give in what is in what remains
• Is not what one would give in among all the others
• Don't give in what is up among what's left (6)
• Oppose one's inclusion during interval
• Don't give in what is in among the others