Seekers of justice squirted nerve gas (8)

I believe the answer is:
avengers
'seekers' is the definition.
The definition and answer can be both people as well as being plural nouns.
Maybe they are linked in a way I don't understand?
'justice squirted nerve gas' is the wordplay.
'nerve gas' anagrams to 'AVENGERS'.
But, I'm not clear how the anagram is indicated.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for avengers that I've seen before include "They retaliate" , "1960s TV series with Steed and Emma Peel" , "They seek or inflict retribution" , "Retaliating fighters" , "Agents of retribution" .)
