Josiah, - J O H - from John in the clue. ' Not new ' in the clue means you remove the N from John, which leaves you with J O H and ' is a ' from the clue. Now an anagram of J O H and I S A gives the answer Josiah.
The clue tells you John - not new. So remove the letter N from John.
This leaves you with J O H . Then the clue says ' is a wreck. ' If you take the J O H & the IS A, this anagram will give you JOSIAH, which is probably the answer.