Solutions Know-all has 6 entries with similar clues
- helga........ geerhart, private played by kim hartman in 'allo 'allo!
- metalsApproximately three-quarters of all known chemical elements
- obscureNot at all well-known
- omniscientAll knowing
- franklampardChelsea's all-time leading goalscorer, with 211 goals in all competitions
- round-the-clockAll day and all night