Cleverness alone is sure to come off very badly against cleverness and knowledge combined.
This is, more or less, the first thing beginners learn.
Movies and such portray chess as a game of cleverness, but this is vastly underestimating it.
Chess is a skill. To be good, you have to practice and learn a hell of a lot. Cleverness, basically, has nothing to do with it.
Of course you should include openings in your study plan, along with endgames, tactics, and strategy. But you should study them in the right way, a way that actually improves your chess. Study them to understand the principles, pawn structures, and stretegic and tactical patterns behind them. What you should not do is blindly memorize opening theory. But that's what many chess players think studying openings is, and that's what others tell them not to do.