Magician broadcast hen's trances (11)
I believe the answer is:
enchantress
'magician' is the definition.
(I have seen 'Female magician ' mean 'enchantress' so perhaps 'magician' could also mean 'enchantress')
'broadcast hen's trances' is the wordplay.
'broadcast' is an anagram indicator (letters scattered or cast around).
'hens'+'trances'='henstrances'
'henstrances' with letters rearranged gives 'ENCHANTRESS'.
(Other definitions for enchantress that I've seen before include "Siren" , "Witch" , "One casting spells" , "Seducer" , "Female magician" .)