Broadcaster is keen to poach star (8)
I believe the answer is:
asterisk
'star' is the definition.
('asterisk' can be a synonym of 'star')
'broadcaster is keen to poach' is the wordplay.
'to poach' indicates the answer is hidden within the clue.
'ASTERISK' is hidden in the letters of 'broadcaster is keen'.
(Other definitions for asterisk that I've seen before include "Sign" , "Sarkiest (Anag)" , "Star-shaped mark in printing" , "Star-shaped character used in printing" , "Star-like symbol as reference mark" .)