I have solved all the clues: I have found a way of altering the four answers requiring such treatment by replacing a two-letter word within each of them with creatures all of a kind, but I am now stuck.
If I am on the right track, I think I am looking for an example, or examples of metamorphosis and having read post 86, I thought I might be able to find such within the relevant works, but Google has failed to deliver. I am trying not to be too specific, for fear of infringing the rules of this site, but perhaps some kind soul could indicate whether or not it sounds as though I am on the right lines.