Healthy hot drink (4)
I believe the answer is:
hale
'healthy' is the definition.
('hale' can be similar in meaning to 'healthy')
'hot drink' is the wordplay.
'hot' becomes 'h'.
'drink' becomes 'ale' (ale is a kind of drink).
'h'+'ale'='HALE'
(Other definitions for hale that I've seen before include "Sound of body" , "Strong and healthy" , "Well" , "Showing vigorous good health" , "Healthy and hearty" .)