end my suffering

-- Clockwork.item is a library, with a function named New, that accepts a string as an input parameter, and returns an item table.
local ITEM = Clockwork.item:New("consumable_base");

-- All kinds of variables the item uses, the type varies but it should be self explanatory.
-- Any text that isn't the variable or a function should be in quotes, basically.
ITEM.name = "Banana";
ITEM.uniqueID = "banana";
ITEM.spawnValue = 7;
ITEM.spawnType = "consumable";
ITEM.category = "Consumable";
ITEM.cost = 25;
ITEM.health = 6;
ITEM.hunger = 40;
ITEM.thirst = 15;
ITEM.model = "models/bioshockinfinite/loot_banana.mdl";
ITEM.weight = 0.4;
ITEM.access = "v";
ITEM.business = true;
ITEM.description = "A fresh yellow-skinned banana, grown by the powers that be in the outlands. It tastes sweet and succulent... Get your mind out of the gutter.";

-- Now you're calling the Register function on the item table you got from Clockwork.item:New, again, it's a function so put a colon :
ITEM:Register();