Cover was thrown over article (6)
I believe the answer is:
swathe
'cover' is the definition.
(I've seen this before)
'was thrown over article' is the wordplay.
'thrown' is an anagram indicator.
'over' means one lot of letters go next to another.
'article' becomes 'the' (the 'definite article' part of speech).
'was' with letters rearranged gives 'swa'.
'swa'+'the'='SWATHE'
(Other definitions for swathe that I've seen before include "put bands around" , "Wrap in layers of warm garments or bandages" , "considerable cut" , "Wrap in bandages - broad mown band" , "A broad strip as of cut grass" .)