In broadcasting, one enters a winding road (5)
I believe the answer is:
radio
'in broadcasting' is the definition.
'radio' can be an answer for 'broadcasting' (radio is a kind of broadcasting). I am unsure of the 'in' bit.
'one enters a winding road' is the wordplay.
'one' becomes 'i' (Roman numeral).
'enters' means one lot of letters goes inside another.
'a winding' indicates an anagram.
'road' anagrammed gives 'rado'.
'i' going within 'rado' is 'RADIO'.
Can you help me to learn more?
(Other definitions for radio that I've seen before include "Receiving device" , "means of communication" , "Contact" , "Electronic receiver" , "Transistor" .)