Hear test broadcast in places where many a player takes part (8)
I believe the answer is:
theatres
'places where many a player takes part' is the definition.
(where actors may get theatrical parts)
'hear test broadcast' is the wordplay.
'broadcast' is an anagram indicator.
'hear'+'test'='heartest'
'heartest' is an anagram of 'THEATRES'.
'in' is the link.
(Other definitions for theatres that I've seen before include "Lecture rooms with seats rising in tiers" , "Scenes of important events, like playhouses" , "operational locations" , "Drama venues" , "They're for surgery, drama and lectures" .)