Clay is a block typically found underwater in shallow areas, especially in rivers and lakes. It can be mined with any tool or by hand, but a shovel is the quickest method. When broken, it drops four clay balls, which can be smelted into terracotta or crafted back into a clay block. Players often use it for crafting bricks, an essential material for decorative building purposes due to its distinctive, malleable properties.
The numerical item ID for Clay is 337
Numerical item IDs will only work in Minecraft versions below 1.13.
The item ID for Clay is minecraft:clay_ball
This is the spawn command to give yourself Clay in Minecraft which includes the Minecraft /give command. If you are using the Essentials plugin you will need to use /minecraft:give instead of /give