Am having great trouble with 2 clues
No.15 - Agreeable ass used to unearth black gold (7)(6) I know black gold refers to oil but cannot get answer from any other clue words.
No.85 - Disposing of family silver in a race? (7)(5) - think last word may be plate and have looked up races ending in plate - the only one being Northumberland but this is too long for clue.
Any hits would be greatly appreciated