"Snowpiercer" network (3)
I believe the answer is:
tnt
'snowpiercer network' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tnt that I've seen before include "Initially, powerful explosive" , "Explosive compound" , "Very powerful explosive, compressed" , "Type of high explosive" , "Explosive stuff" .)