Yes, clap is a Scrabble word!

Verb

1. Put quickly or forcibly

2. Cause to strike the air in flight

3. Clap one's hands or shout after performances to indicate approval

4. Clap one's hands together

5. Strike the air in flight

6. Strike with the flat of the hand; usually in a friendly way, as in encouragement or greeting

7. Strike together so as to produce a sharp percussive noise

Noun

1. A sudden very loud noise

2. A common venereal disease caused by the bacterium Neisseria gonorrhoeae; symptoms are painful urination and pain around the urethra

3. A sharp abrupt noise as if two objects hit together; may be repeated