IPA: /ˈkliːnər/
KK: /ˈklinɚ/
A person or machine that cleans something, often used for cleaning homes, offices, or clothes.
The cleaner came to tidy up the office every week.
Cleaner → It is formed from "clean" (from Old English *clæne*, meaning free from dirt or impurities) and "-er" (meaning a person who). The word "cleaner" refers to a person who makes something free from dirt or impurities.
Think of someone who makes things 'free from dirt' ('clean') — the '-er' just means a person. A cleaner is someone who cleans.