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"suckerfish" is also used as a crossword clue. If that's what you saw, the answer is often remora (6 letters).
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Definitions
marine fishes with a flattened elongated body and a sucking disk on the head for attaching to large fish or moving objects
Word origin
From sucker + fish.
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer0 curated clues
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