He can't broadcast - employ a singer (9)
I believe the answer is:
chanteuse
'a singer' is the definition.
(French term for a female singer)
'he can't broadcast employ' is the wordplay.
'broadcast' indicates an anagram (letters scattered or cast around).
'employ' becomes 'use' (synonyms).
'he'+'cant'='hecant'
'hecant' anagrammed gives 'chante'.
'chante'+'use'='CHANTEUSE'
(Other definitions for chanteuse that I've seen before include "A French female nightclub singer" , "Female popular singer" , "She sings popular songs" , "Female singer, in a nightclub perhaps" , "French female singer in tune chase" .)