Ally intercepting American war weapon (6)

I believe the answer is:

napalm

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'weapon' is the definition.
(I have seen 'Incendiary weapon ' mean 'napalm' so perhaps 'weapon' could also mean 'napalm')

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

Can you help me to learn more?

(Other definitions for napalm that I've seen before include "Incendiary bomb ingredient" , "Flame thrower ingredient" , "destroy by fire" , "Chemical weapon" , "Incendiary agent" .)

I've seen this clue in The Telegraph.

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