Crossword Genius

W is for weapon (7)

Ross

I believe the answer is:

warhead

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'w' is the definition.
(head of the word 'war')

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for warhead that I've seen before include "bit of a weapon" , "Charge" , "Missile's explosive" , "Explosive missile part" , "Missile explosive unit" .)

I've seen this clue in The Guardian.
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