Related Clues:

• -- reef
• It's hard to abandon singing the praises of certain islands
• A Beethoven symphony, not hard rock, perhaps
• Carbon said to be in hard material
• Shoal; take in (sail)
• The sort of knot sailors consider dangerous
• Take in (part of sail)
• Band fronted by Gary Stringer
• Band with an affinity to the Coral?
• Marine formation incorporating part of tree fern
• Reef substance
• Reef-forming skeletons
• Pink and black material will be about right
• One whistles, crossing close to extreme marine hazard
• Coral or rock just below sea surface