Possible Clues:

• Journalists' quests
• To a certain degree they were in Britain
• Viewpoints of the obtuse, perhaps?
• eg, Right, acute, obtuse
• One goes fishing, but only to a certain degree
• They could be obtuse, though they founded Mercia
• They're old people, but they get their degrees (6)
• They're all right in squares
• They're measured in degrees
• Ancient Britons, to a degree (6)