Possible Clues:

• An escort (anag.)
• Wicked courtesan, non-U, identified as forebear
• Acorn set to become start of tree
• Great-grandfather, for instance, eats corn only if well cooked
• One of one's forebears
• Scorn tea makers, not being of the modern generation
• A relatively historical figure
• One known for forbearance
• A forebear, a wise old man who went round clubs
• Not involved with races, one is up a tree