Crossword Genius

Hand guard sharp spike to stop Lord Sebastian? (8)

Ross

I believe the answer is:

coquille

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

'hand' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's a link between them I don't understand?

I can't explain the rest of the clue.

Can you help me to learn more?

I've seen this clue in The Independent.
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