Crossword Genius

Missile that may be found on the beach (5)

Ross

I believe the answer is:

shell

I'm a little stuck... Click here to teach me more about this clue!

'missile' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for shell that I've seen before include "Bit of explosive" , "Mortar missile" , "Hard protective case" , "Tortoise's home" , "attack with bombs" .)

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