Has leaders of Oprah Winfrey Network sacked (4)
I believe the answer is:
owns
'has' is the definition.
('own' can be a synonym of 'have')
'leaders of oprah winfrey network sacked' is the wordplay.
'leaders of' indicates taking the first letters.
The initial letters of 'oprah winfrey network sacked' is 'OWNS'.
(Other definitions for owns that I've seen before include "uses" , "Possesses" , "Has possession of by right" , "Admits possession" , "Confesses" .)