Related Clues:

• Abstain
• Religious abstention
• Like Mad
• Intentionally skip meals
• Like lightning
• More than diet
• Like some friends
• Word that can precede the first word of 17-, 26-, 43- or 58-Across
• Observe Lent
• Fleet of foot
• See 117-Down
• Firmly fixed
• Like a cheetah
• ''Spartacus'' novelist
• How a painkiller should act