There's nothing about article, but it may be filed (4)
I believe the answer is:
nail
'it may be filed' is the definition.
(I've seen this in another clue)
'there's nothing about article' is the wordplay.
'there's nothing' becomes 'nil' (nil means a score of zero in football).
'about' is an insertion indicator.
'article' becomes 'a' (the indefinite article in English).
'nil' placed around 'a' is 'NAIL'.
'but' acts as a link.
(Other definitions for nail that I've seen before include "Finger feature (and tooth?)" , "Claw" , "Metal pin, hit it on the head" , "Spike, tack" , "Hammer's target" .)