Attended to large group during speeches (5)
I believe the answer is:
heard
'attended to' is the definition.
(I've seen this before)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for heard that I've seen before include "Got to know (of)" , "Picked up by the ears?" , "Perceived sound" , "Was told of" , "Detected aurally" .)