Possible Clues:

• G or R issuer: Abbr.
• Org. that approves trailers
• NC-17 issuing org
• PG-13 issuer (abbr.)
• Org. assigning PG-13 or R
• Film lobby, for short
• Org. associated with filmratings.com
• ''R for language'' evaluator
• Org. with film ratings
• Bestower of PG's and R's, formerly