Temporary educator

Wiktionary Word definitions in Wiktionary
n. (context British parts of Canada English) a teacher who fills a temporary position in a school on a short-term basis; often supplied by an agency

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun EXAMPLES FROM CORPUS ▪ A wandering supply teacher came to our rescue. ▪ Returned bus list to Office. 9.15: Checked with supply teacher if she needed my help while Welfare Assistant was out. ▪ Second, ensure there is a supply teacher available and prepare ...