Broadcast contains hot entertainment (4)
I believe the answer is:
show
'entertainment' is the definition.
(show is a kind of entertainment)
'broadcast contains hot' is the wordplay.
'broadcast' becomes 'sow' (sowing is a kind of broadcasting).
'contains' means one lot of letters goes inside another.
'hot' becomes 'h'.
'sow' placed around 'h' is 'SHOW'.
(Other definitions for show that I've seen before include "Performance" , "programme" , "Demonstrate or reveal" , "The world of entertainment" , "Display or exhibition" .)