Henry East is heartily healthy (4)
I believe the answer is:
hale
'heartily healthy' is the definition.
'hale' can be an answer for 'healthy' (hale can mean fit and healthy). I'm not sure about the 'heartily' bit.
'henry east' is the wordplay.
'henry' becomes 'hal' (short for Henry).
'east' becomes 'e' (synonyms).
'hal'+'e'='HALE'
'is' is the link.
Can you help me to learn more?
(Other definitions for hale that I've seen before include "Sound of body" , "Healthy and robust" , "Showing vigorous good health" , "Healthy and hearty" , "Strong and healthy" .)