I've solved it. It's a real stinker, even by SAGA standards!Another word for "Pooh!" is "Pshaw!" It doesn't start, leaving "Shaw" - which is a small wood. Thanks for trying,grasscarp.
Thanks for your answer, kayakamina. This is about the third time that I've eventually given up on a clue, posted a request for help, and then solved the clue myself before an answer came up!