Crossword Genius

Having cut off tails, has to dispose of shellfish (6)

Ross

I believe the answer is:

mussel

'shellfish' is the definition.
(I know that mussel is a type of shellfish)

I don't understand the remainder of the clue.

(Other definitions for mussel that I've seen before include "Black marine bivalve" , "Common edible marine mollusc" , "Shellfish sounds like part of the body" , "Edible bivalve mollusc, common in sea" , "The shellfish sounds strong" .)

I've seen this clue in The Guardian.
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