Solutions All: Prefix has 3 entries with similar clues

• 5-letter words
• helga........ geerhart, private played by kim hartman in 'allo 'allo!
• 12-letter words
• franklampardChelsea's all-time leading goalscorer, with 211 goals in all competitions
• 15-letter words
• round-the-clockAll day and all night