Concerning sight of news stories as leader moves further right (7)
I believe the answer is:
optical
'concerning sight' is the definition.
(relating to sight)
I cannot understand how the remainder of the clue works.
(Other definitions for optical that I've seen before include "Sort of illusion" , "Topical (anag.)" , "Using visible light" , "Sighted" , "Coal tip (anag)" .)