Android - How do you clear share actions bound to ‘copy to clipboard’?

There are multiple ways to clear "default actions":

• Walking through the list of apps in Settings→Apps→Manage Apps, looking at each entry whether it has a "Clear defaults" button, and hit that (not very user-friendly -- and in this special case obviously not applyable, as the action seems not bound to a special app)
• Using a helper app like e.g. Default App Manager or DefaultApp Reset (much more user-friendly -- but not suitable in this case, for the same reason as the previous point)
• Installing another app which uses the same intent (in case of a "homescreen launcher" and the "home" key, another launcher, to give an example) -- not always easy to figure out what app might be fitting for this purpose. This is what lead to success in our case here, by installing Andmade Share
  Note: You do not need to keep that app installed. It's the installation of the app which "drops" the default. This is also the purpose why the next item works:
• Updating/uninstalling one of the apps currently using this intent (to take above example: that's why you will be asked again when your launcher received an update) -- this point just for completeness :)

Although the solution by Izzy (above) is brilliant, it did not work for me on Nexus 5 running Android 4.4. I ran into the bug after installing a to-do app. Every time I tried to share a page in Chrome, it defaults to Google Keep! Strange, but the problem and the solution is given here:

http://www.reddit.com/r/Android/comments/1rcnow/did_the_default_behavior_of_share_change_in/

Essentially, you just need to go to Settings...Apps, then click the overflow menu in the top right. When it opens, select Reset App Preferences. Other than having to select my default launcher again, it seems to have solved the problem with no side effects.

Credit to tacomonstrous at Reddit for the solution.