The crossword world is teeming with BARNACLEs. We just had one show up in Sunday Times 4302 yesterday, and here is another in today's The Hindu Crossword 9374.
Times 4302: Twisted cable ran to this underwater attachment (8) BARNACLE*
THC 9374: Block the clean sort of creature (8) BAR NACLE*
Here are older occurrences of the word.
Guardian 24475: Sticker to bottom (8) BARNACLE [CD]
THC 8500: Clear ban, somehow, on something difficult to get rid of (8) BARNACLE*