Possible Clues:

• 'Porous, absorbent substance (6)'
• The sucker may have gone and got twisted at last
• There's a sucker to cadge off
• Parasite without tail that lives in the sea
• Absorbing character from Surtees
• Light, absorbent skeleton of an aquatic mammal
• Aquatic creature - cadge
• *Animal cleaner
• An inhabitant of water that's cleaner
• Wipe