I used the term here a couple of years ago because I didn't know what to call the beast, and was informed that the correct term is indirect anagram. I still prefer ghost anagram, and I think using one is never justified. There are simple ones, like using "demented duck", say, to arrive at "late" (from teal), but one can see (I think) how unfair this really is. I for one feel that the anagram fodder should be present in the clue, no matter how short or simple the anagram is.