General synonyms:
* Smart: This is a very common and general synonym for clever.
* Intelligent: This emphasizes the ability to think and understand.
* Bright: This suggests a quick mind and a good understanding.
* Sharp: This emphasizes the quickness and wit of the person.
* Astute: This suggests a keen understanding and good judgment.
* Ingenious: This emphasizes the creativity and originality of the person's ideas.
* Resourceful: This suggests the ability to find solutions to problems.
* Shrewd: This suggests a practical and cunning mind.
* Wise: This implies good judgment and experience.
More specific synonyms:
* Witty: This suggests a talent for humor and cleverness.
* Cunning: This suggests a sly and manipulative mind.
* Devious: This suggests a clever and dishonest mind.
* Persuasive: This emphasizes the ability to convince others.
* Diplomatic: This suggests the ability to navigate social situations skillfully.
* Articulate: This emphasizes the ability to express oneself clearly and effectively.
The best synonym for "clever" will depend on the specific context and what you want to emphasize.