Nick article that is very boring (6)
I believe the answer is:
thieve
'nick' is the definition.
(I've seen this before)
'article that is very boring' is the wordplay.
'article' becomes 'the' (the definite article in English).
'that is' becomes 'ie' (short for Latin 'id est', 'that is').
'very' becomes 'v' (abbreviation).
'boring' means one lot of letters goes inside another (some letters must 'bore' a hole into other letters).
'ie'+'v'='iev'
'the' placed around 'iev' is 'THIEVE'.
(Other definitions for thieve that I've seen before include "Rob" , "Steal things" , "Pinch" , "Knock off" , "Misappropriate" .)