Empty specific field on saving?

If I wanted to empty a specific field whenever a page is saved, how would I go about that? Is there some kind of ‘save’ hook that I could use?

You can use the panel.page.update hook: https://getkirby.com/docs/developer-guide/advanced/hooks

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Thanks – for anyone looking, this is the code I ended up using:

kirby()->hook('panel.page.update', function($page) {
  // Only update for specific page template:
  if ($page->intendedTemplate() === 'templatename') {
      'fieldname' => ''
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