Conceal literary alter ego in broadcast (4)
I believe the answer is:
hide
'conceal' is the definition.
(I know that conceal can be written as hide)
'literary alter ego in broadcast' is the wordplay.
'literary alter ego' becomes 'hyde' (as in Dr Jekyll and Mr Hyde).
'in broadcast' shows a homophone (sound like).
'hyde' is a homophone of 'HIDE'.
(Other definitions for hide that I've seen before include "Pelt; conceal" , "Screen; skin" , "Conceal - skin" , "go to ground" , "Place to observe wildlife" .)