Common name for the toxic defoliant used by the US military during the Vietnam War (5,6)

I believe the answer is:

agent orange

(Other definitions for agent orange that I've seen before include "Dangerous chemical" , "This takes leaves off" , "Nasty American stripper" , "Defoliant used in the Vietnam war" , "What defoliates" .)

I've seen this clue in The Independent.

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