Possible Clues:

• 'Encore!'
• Grafton's "__ for Burglar"
• Twice, in music
• Again, in music
• Start of an early Grafton title
• Dumbbell curls build them, for short
• Grafton's '__ for Burglar'
• Twice
• ___ and tris (muscle group)
• Arm muscles, in bodybuilding lingo