How I can force enable clean url d7
Clean URL state is managed through the Drupal variable clean_url. 


clean url disabled: clean_url is 0
clean url enabled: clean_url is 1


You can force this value by:


Using drush

drush vset clean_url 1

Using a direct SQL query

UPDATE variable SET value=1 WHERE name='clean_url';

Force a value in settings.php

$conf['clean_url'] = 1;