22 across: Skipping task after a third of booze (3)
I’m not exactly sure of the explanation, but it goes something like this: task after a third of booze = mission after a third of booze = mission after o = omission = skipping.
The problem: skipping and omission don’t match.
Sure, skipping and omission are both nouns, but they’re different types of nouns. Skipping is a mass noun, while omission a count noun. That means you can have five or many omissions, but only much skipping.
Thus and therefore, bullshit.