Related Clues:

• Get through the cracks
• Primordial slime
• What 35-Down may do
• Move like glue
• Creep like lava
• Exhibit, as with smarminess
• Flow slow
• Move like ketchup
• Barely get through
• Escape, as through a crevice
• Slugs do it
• Slip through the cracks?
• Barely flow
• Leak through the cracks
• Enter via osmosis