In good health in bad weather, by the sound of it (4)
I believe the answer is:
hale
'in good health' is the definition.
(I've seen this before)
'bad weather by the sound of it' is the wordplay.
'bad weather' becomes 'hail' (hail is a type of bad weather).
'by the sound of it' shows a homophone (sound like).
'hail' is a homophone of 'HALE'.
'in' is the link.
(Other definitions for hale that I've seen before include "Healthy and hearty" , "Showing vigorous good health" , "Well" , "Strong and healthy" , "Healthy and robust" .)