When you create an avatar on Yahoo! Avatars, this avatar is automatically displayed in your Yahoo! Games profile.
When you're logged in to Yahoo! Games, just click "My Games History" to see your avatar and profile. Deleting your avatar should clear it from your Yahoo! Games profile.
Note: At this time, avatars can't be disabled for a specific alias. Your avatar is displayed for your Yahoo! ID and all profiles associated with that ID everywhere avatars can be used on Yahoo!.