Crossword Genius

Warlord keeps head from Trident weapon (7)

Ross

I believe the answer is:

shotgun

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

'weapon' is the definition.
(shotgun is a kind of weapon)

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

Can you help me to learn more?

(Other definitions for shotgun that I've seen before include "Smooth-bore weapon" , "No thugs (anag) - weapon" , "Hunting firearm" , "arm" , "Type of wedding - weapon" .)

I've seen this clue in The Sun.
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