Very great article short of lines (10)
I believe the answer is:
thundering
'very great' is the definition.
('thundering' can be used for emphasis)
'article short of lines' is the wordplay.
'article' becomes 'thing' (both can mean an object).
'short of' becomes 'under' (I've seen this in other clues).
'lines' is an insertion indicator (inserted letters line the inside of others).
'thing' enclosing 'under' is 'THUNDERING'.
(Other definitions for thundering that I've seen before include "Tremendous" , "Making a loud noise" .)