Possible Clues:

• Entry gained by 500 into a charitable establishment
• Entry fee
• Entrance fee concession
• A confession
• Entrée
• Daughter in Kingsley's island broadcasting acknowledgement
• With this one must confess that it's a let-in, perhaps
• Acknowledge of the truth of something
• These days, embassy makes a charge to go in
• Acknowledgment of crime for which one may be charged