You can't delete a clip, but you can label it so we remove it from the list.

Hit the 3 dots on the right-hand side of the wave in the list and select False Wave. 

Then mark waves with the option that accurately describes the situation. One of the following:

• I didn’t surf this wave
• I can’t find myself in this clip
• I surfed this wave, but I don’t want it
• I tried to catch it but I missed it