Related Clues:

• Etcher's purchase, perhaps
• Part of DNA
• 91-Across, e.g.
• Etcher's purchase
• Like one who cannot let it go
• Hard to swallow
• See 57 Across
• Low pH
• Beer
• Sulfuric or hydrochloric follower
• Type of rain
• Corrosive chemical
• Like some barbecue sauce
• See 48 Across
• Dropped stuff