Crossword Genius

Head sliced off, jiggle fish (4)

Ross

I believe the answer is:

hake

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'fish' is the definition.
(I know that hake is a type of fish)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for hake that I've seen before include "Common food fish" , "Food fish; rhymes with create" , "Cod-like fish" , "Type of fish" , "Swimmer" .)

I've seen this clue in The Telegraph.
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