Possible Clues:

• See 13-Across
• 'Grey's Anatomy' actress Debbie
• — wrench
• Eponym of an L-shaped wrench
• Name hidden in "focal length"
• Paul __, co-founder of Microsoft
• Debbie of 'Fame' and 'Grey's Anatomy'
• Klein who once managed the Beatles and Rolling Stones
• 'Fame' actress and choreographer Debbie
• Singer-songwriter Lily