First off, we must ask what qualifies as "clutch". Is any shot late in any game even if you are up by 40 considered clutch? Does a clutch shot have to happen near the end of a game?
What narratives like this tend to ignore is that those 27 shots that Bell has taken in the final seven minutes of a game or overtime represent only 22% of his three point attempts. That is nowhere close to an adequate sample size. If he were to do this over the course of 100 shots at the end of games, then there would be more to go on, but how can you make such a definitive observation after 27 shots?
There is also the fact that the final seven minutes of a game is an arbitrary starting point. What would his shooting percentage be if you started it three minutes earlier or two minutes later?
The chances are that Bell's shooting at the end of games, which has been excellent will regress to somewhere around his career average, because that's what tends to happen.
The data shows us that James Bell is a good shooter, which is fine, and what limited data we have shows that he's been good at the end of games, but don't call him "clutch" based on such conditional numbers.