Crossword Genius

Fish which reportedly did for Henry I (7)

Ross

I believe the answer is:

lamprey

(Other definitions for lamprey that I've seen before include "Long fish" , "sucker in the main" , "Eel-like bloodsucker" , "Fish with sucker mouth" , "Eel-like vertebrate with a sucker mouth and horny teeth" .)

I've seen this clue in The Guardian.
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