Toxic campaign in Africa where calm disrupted (8,7)

I believe the answer is:

chemical warfare

I'm a little stuck... Click here to teach me more about this clue!

'toxic campaign' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'africa where calm disrupted' is the wordplay.
'disrupted' is an anagram indicator.
'africa'+'where'+'calm'='africawherecalm'
'africawherecalm' with letters rearranged gives 'CHEMICAL WARFARE'.

'in' is the link.

Can you help me to learn more?

(Another definition for chemical warfare that I've seen is " hostilities requiring gas masks?".)

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