Delete the key, and that will clear all items. Not having the list at all is similar to not having any items in it. Redis will not throw any exceptions when you try to access a non-existent key.
DEL key
Here’s some console logs.
redis> KEYS * (empty list or set) redis> LPUSH names John (integer) 1 redis> LPUSH names Mary (integer) 2 redis> LPUSH names Alice (integer) 3 redis> LLEN names (integer) 3 redis> LRANGE names 0 2 1) "Alice" 2) "Mary" 3) "John" redis> DEL names (integer) 1 redis> LLEN names (integer) 0 redis> LRANGE names 0 2 (empty list or set)