Weapon used in the heat of the moment? (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 "Highly flammable jelly" , "Liquid used in flame-throwers" , "Jelly used in fire bombs and flame-throwers" , "Incendiary agent" , "attack with bombs" .)

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