I will try to explain, but not defend the clock theory. It will be a poor effort.

People like to find patterns and decodes. Unless you were following Q drops in live time, there is going to be info/significance missed when looking retrospectively.

Early on people noticed that certain posts lined up to other posts. (As far as I know the Q team didn't explicitly promote the clock idea). When there were fewer posts connections were easier to see.

In seeing these patterns someone created a model (a circle that keeps spiraling from the center) and doing this lines up dates where posts had things in common. Think of it like a q delta (yearly) but more frequent.

As the circle kept going around people would draw straight lines radiating out and noted commonalities. However I think there is a danger in confirmation bias (as there are many posts that don't line up according to Q clock model).

Part of following Q is finding patterns, q proofs, and datefagging and the Q clock is an example of trying to find meaning in the cryptic posts. I am sure some connections were missed by the anons and some faulty connections were formed. The clock is one tool among many ways people came up with to find the pattern to Q posts.

I find it interesting but at this point not helpful. As the Q clock was accepted early on, it just continued to grow as more posts dropped.

Back then it was cool. Now it doesn't seem of much help.