Lean news after one's invested in broadcaster (6)
I believe the answer is:
skinny
'lean' is the definition.
(similar in meaning)
'news after one's invested in broadcaster' is the wordplay.
'news' becomes 'nn' (an abbreviation for new written twice).
'after' is a charade indicator (letters next to each other).
'one' becomes 'i' (Roman numeral).
'invested in' is an insertion indicator.
'broadcaster' becomes 'sky' (Sky is a television company).
'nn' after 'i' is 'inn'.
'inn' placed within 'sky' is 'SKINNY'.
(Other definitions for skinny that I've seen before include "Spare: coffee with skimmed milk" , "Unattractively thin" , "stout? Certainly not!" , "Type of dip" , "little of substance?" .)