Confine to broadcast as a series (2,4)
I believe the answer is:
in turn
'confine to broadcast' is the definition.
I can't tell whether this defines the answer.
'as a series' is the wordplay.
'as' becomes 'in' (I've seen this in other clues).
'a series' becomes 'turn' (I can't justify this - if you can you should give a lot more credence to this answer).
'in'+'turn'='IN TURN'
Can you help me to learn more?
(Other definitions for in turn that I've seen before include "not out of place" , "orderly treatment" , "One after another" , "in an orderly fashion" , "a succession of things happen" .)