An explosive type, as Churchill was? (7)

I believe the answer is:

warhead

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'an explosive' is the definition.
(I know that warhead is a type of explosive)

I can't explain the rest of the clue.

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

I've seen this clue in The Times.

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