Possible Clues:

• Parsons of The Byrds
• The 'G' in EKG
• Flying Burrito Brothers member Parsons
• Scale marking
• -- Parsons, country rock singer and a member of The Byrds in 1968
• It goes with tele- or epi-
• A little fat
• 1/1000 of a kilo
• Metric system unit
• See 67-Across