> \onslide*{1}{{\red power}}\onslide{2+}{power}%
> \onslide*{2}{{\red dot}}\onslide{3+}{dot}
> \onslide*{3}{{\red is very clever}}\onslide{3+}{is very clever}
BTW, this could well be written as
{\onslide*{1}{\color{red}} some text}
which avoids the duplication.
-Hendri.
