Clue: Joint paper on British novelist making waves (8)
Answer: TSUNAMIS
Explanation: Definition: waves
 T(a right-angled joint, in wood, say, shaped like the letter "T") + SUN(a British tabloid newspaper) **placed above**(on, in a down clue) AMIS(Kingsley or Martin, father and son British novelists).
Defn: Giant ….