Clue: Wills and Harry? Troublesome pair, as Anne heard (2,4,3,1,5)
Answer: AN HEIR AND A SPARE
Explanation: Wills and Harry? Troublesome pair, as Anne heard (2,4,3,1,5)
An anagram ('troublesome') of 'pair as Anne heard'. The answering phrase refers to the recommendation that a monarch should have two offspring, the second to succeed if anything happens to the first. Although Charles is not yet king, he has fulfilled his quota with the Princes William and Henry (often known as Wills and Harry respectively). Also, in passing, Princess Anne was at one time the SPARE.