I assume you are talking about the decrepid plane clue. I have an answer that means speed and starts at the 4th cell of the 8th row. I couldn't work out the wordplay though!
The amphibian is a newt. insects primarily is "i". combine that with he, poo(l) and h(ot) and you get a non-word which is a cryptic clue to a children's novel (although some adults also like it!)