Covering the point as he rewrites the article (9)
I believe the answer is:
sheathing
'covering the point' is the definition.
'sheathing' can be an answer for 'covering' (sheathing is a kind of covering). I am not certain of the 'the point' bit.
'as he rewrites the article' is the wordplay.
'rewrites' indicates anagramming the letters (I've seen 'rewriting' mean this).
'the article' becomes 'thing' (both can mean an object).
'as'+'he'='ashe'
'ashe' with letters rearranged gives 'shea'.
'shea'+'thing'='SHEATHING'
Can you help me to learn more?
(Other definitions for sheathing that I've seen before include "putting it in a case" , "protective covering" .)