Wash black articles (5)
I believe the answer is:
bathe
'wash' is the definition.
(I've seen this in another clue)
'black articles' is the wordplay.
'black' becomes 'b' (as in pencil classifications).
'articles' becomes 'athe' (two examples of the part-of-speech: a+the).
'b'+'athe'='BATHE'
(Other definitions for bathe that I've seen before include "Wash, soak" , "bit of swimming" , "go into rollers?" , "Immerse in liquid for wash" , "Wash in water" .)