Black articles in wash (5)
I believe the answer is:
bathe
'wash' is the definition.
(I've seen this before)
'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'
'in' is the link.
(Other definitions for bathe that I've seen before include "spend time in the water" , "Take dip in sea" , "Become immersed in" , "Wash, soak" , "go into rollers?" .)