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)
This is the entire clue.
(Other definitions for aloud that I've seen before include "Not silently or in a whisper" , "In an audible voice" , "that listeners can receive" , "Using the voice, not silently" , "in a normal voice" .)