Drupal 7 - Node specific template not working
If you haven't already done so, I'd recommend enabling theme debugging feature of Drupal 7.

In the settings.php file, or preferably in settings.local.php file if you have one, add the following line, and clear the cache once more.

$conf['theme_debug'] = TRUE;



  When debugging is enabled:
  - The markup of each template is surrounded by HTML comments that contain
    theming information, such as template file name suggestions.
  - Note that this debugging markup will cause automated tests that directly
    check rendered HTML to fail.  
  
  For more information about debugging theme templates, see
  https://www.drupal.org/node/223440#theme-debug.
  
  Not recommended in production environments.


This should give you the available template name suggestions in the generated HTML.