Clutter really is just delayed decisions. Those clothes in the back of your closet waiting for you to decide whether to keep or donate. That pile of mail that needs to be dealt with. The emails you need to return but are avoiding. Those are all decisions that need to be made.
You can decide to keep the clothes or drop them off at Goodwill. You can sit down and sort through the mail. And you can either delete or respond to the emails (or respond and then delete). Either way, you need to make a decision.
What decisions do you need to make to clear out some clutter? Get to it!