district in Anhui province
滁 is a rare kanji used primarily as a place name, specifically a district in Anhui province. Its standalone meaning is tied to that geographic reference.
滁 combines the water radical 氵 with 除, which likely contributes the sound. It is a specific place-name character, and its historical development beyond that is uncertain.
The water radical 氵 beside 除 suggests a river or water-related place. Think of it as the name of a district by a river in Anhui.
For チョ, imagine a sign for the district with a picture of a chō (butterfly) near the water: chō -> チョ.
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