Allowed to be heard (5)
I believe the answer is:
aloud
'allowed to be heard' is the definition.
I can't judge whether this defines the answer.
'allowed to be heard' is the wordplay.
'to be heard' indicates a 'sounds like' (homophone) clue.
'allowed' is a homophone of 'ALOUD'.
Can you help me to learn more?
(Other definitions for aloud that I've seen before include "intended for audience" , "For all to hear" , "Take part in, link" , "it is said" , "Not sotto voce" .)