Article continues below advertisementAndrew Mountbatten-Windsor is said to have delivered a withering one-word put-down of Meghan Markle, describing her as an "opportunist," according to a new royal biography alleging the remark intensified already strained relations within the family.OK! can reveal Andrew, 66, is at the center of fresh claims in Betrayal: Power, Deceit And The Fight For The Future Of The Royal Family by Tom Bower, which examines the divisions between the Sussexes and the wider royal household.