Possible Clues:

• Refuse to take "no" for an answer
• Collins is trying to conceal demand
• Agreed to be taken out of ringside seat - I kid you not
• 'Demand, make sure (6)'
• Demand from assassins is threat
• Partial to gains, I stake claim
• 'No, really, this one's on me'
• Demand isn't changing externally, is internally
• Not take "no" for an answer
• Not back down