Related Clues:

• Flat floating structures
• Bane of pool owners
• Tank buildup
• Food for tadpoles
• Swimming pool woe
• Pond flora
• Sea growth
• Tiny pond organisms
• It's a long game without money and a problem for The 'Pool'?
• Crowds lifeboats
• Plants like seaweed
• Simple plants produced liquor - over a gallon drunk?
• Simple organisms, e.g. seaweeds
• Thallophytes, in original Gaelic
• Eg, seaweeds