Related Clues:

• Time in the slammer
• Suck up
• Stretch ... or a hint to this puzzle's theme?
• Extracted chemical
• Bring something latent out
• Obtain by interrogation
• Protract
• Drain furtively, maybe
• Remove with effort
• Draw forth, as memories
• Spin out
• Infer from data
• Derive (from) ... or a two-part hint for understanding 17-, 33-, 42- and 58-Across
• Summon forth
• Gas thief's device