Well it depends on how you frame the problem. The analysis that has been done on "clutch" trying to isolate those situations (close and late, base runners, down a run) all have resulted in no satisfactory answers. You just get good hitters being good hitters. You also get to the conceptual problem - for instance Ortiz hit one of the most clutch home runs in recent history in 2013. He also had a very bad series in general - considering the Sox lost 2 games, there were a myriad of important at bats he did not deliver. Did the clutchiness go away?
Now, just thinking about it, I'd expect anti-clutchness to be more measurable - but there has not been a unified definition of what is a clutch situation. Kimmi is right though. Large issues of makeup keep guys out of the show.