I'm not kidding you at all. Clutch hitting comes from a matter of luck, basically. The more at bats you collect in a sample, the more a player's situational stats tend to resemble his real stats. Look at Reggie Sanders. Luckily, Yahoo has situational stats all the way back to 1987, so we can measure his entire career. Total, he has an .835 career OPS. With RISP and 2 out, its .870. Down the list, they all fall in the 800 level. Derek Jeter, clutch god, does his best hitting with the bases empty, although his situational stats tend to match his career stats.
I've yet to see a truly "clutch" measuring tool, and I don't think one exists. If a player truly is clutch, he should perform at a high level all the time. When a player has tremendous numbers in a single category, its usually due to a small sample of at bats. Nothing more.