Direct opposites:
* Confuse: This directly means to make something unclear or difficult to understand.
* Obscure: This means to make something unclear or hidden.
* Muddle: This means to make something confused and unclear.
* Obfuscate: This is a more formal word for making something deliberately unclear or confusing.
Other possibilities:
* Complicate: This means to make something more complex or difficult to understand.
* Vague: This means to be unclear or imprecise.
* Ambiguous: This means to have more than one possible meaning, making it unclear which is intended.
* Distort: This means to twist or change something, making it inaccurate or misleading.
The best opposite for "clarify" will depend on the specific situation.