Allowed to speak so as to be heard (5)
I believe the answer is:
aloud
'so as to be heard' is the definition.
(I've seen this in another clue)
'allowed to speak' is the wordplay.
'to speak' indicates a 'sounds like' (homophone) clue.
'allowed' is a homophone of 'ALOUD'.
(Other definitions for aloud that I've seen before include "Not under breath" , "Audibly" , "So as to be heard" , "Not sotto voce" , "Not silently or in a whisper" .)