Stop that article going out about war (6)
I believe the answer is:
thwart
'stop' is the definition.
(thesaurus)
'that article going out about war' is the wordplay.
'article' becomes 'a' (indefinite article).
'going out' indicates named letters should be taken away.
'about' means one lot of letters goes inside another.
'that' with 'a' removed is 'tht'.
'tht' going around 'war' is 'THWART'.
(Other definitions for thwart that I've seen before include "Frustrate or foil" , "Frustrate and obstruct" , "Snooker" , "Prevent from succeeding" , "Stymie" .)