Related Clues:

• Like a 13- Across, perhaps
• Slippery, in a way
• Long and slippery
• Hard to grasp, say
• Long and undulating
• Elusive, in a way
• Too wiggly to hold
• Wriggly, as a fish
• Cathedral on verge of collapse? That’s fishy
• Readied, as a baking pan
• Covered with oil
• Too wriggly to get hold of
• Wet and squirmy