Alp man makes up the highly incendiary liquid (6)

I believe the answer is:

napalm

(Other definitions for napalm that I've seen before include "Incendiary substance" , "Incendiary jelly used in flamethrowers" , "destroy by fire" , "Does Ma plan to use the sticky jelly in fire bombs?" , "Firebomb jelly" .)

I've seen this clue in The Irish Times.

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