When running drush cc all I got "cache-clear all` is deprecated for Drupal 8 and later" although it's a D7 installation. Running drush without parameters gave me the hint that the "Drupal root was not found". It looks like Drush 9 is not really compatible anymore with D7. Downgrading to Drush 8 helped:
composer global remove drush/drush composer global require drush/drush:8.1.10
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