Robust address being heard (4)
I believe the answer is:
hale
'robust' is the definition.
(in good health)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for hale that I've seen before include "Showing vigorous good health" , "Healthy and hearty" , "Sound of body" , "Well" , "Strong and healthy" .)