Thanks for your help here, MrVacca.
Thanks for reaching out! Deleting your video clip can be done in the Nest app or Google Home app. May I know what type of camera you have? Do you have an Android or iPhone? Also, are you using the Nest app or Google home app?
If you have the 1st gen Nest cameras, give these steps a try:
If you want to view the clip before you delete it, select the clip and select Play .
Let me know how it works.