According to WNT, a Ruischpijper is "a person who plays on ruischpijp (bagpipe)".
Sources
Web
➺ WNT (Ruischpijp, Afl. en samenst.; without reference) [NB: To enable reading the entire text, the page needs to be "unfolded": Activate subbetekenissen ▀ | citaten ▀ (➺ top left), or click on + | ↪ (in the text); ws]