Possible Clues:

• Film-rating gp.
• Org. that gives G's and R's
• X-rater, once
• Film-rating grp.
• "This Film Is Not Yet Rated" subj.
• Assigner of PGs
• PG-13 bestower
• Assigner of G's and R's: Abbr.
• Rating org.
• Assigner of R's