General Intelligence & Skill:
* Intelligent
* Bright
* Sharp
* Astute
* Shrewd
* Smart
* Quick-witted
* Ingenious
* Resourceful
* Talented
Cunning & Deceitful:
* Sly
* Wily
* Cunning
* Artful
* Devious
* Tricky
Witty & Humorous:
* Witty
* Funny
* Humorous
* Sarcastic
Creative & Inventive:
* Creative
* Innovative
* Original
* Imaginative
Other options:
* Sagacious (wise)
* Perspicacious (having keen mental perception)
* Adroit (skillful)
* Dexterous (skillful with the hands)
* Proficient (competent)
The best word to use depends on the specific context and the type of cleverness you want to convey.