Mangy hound Edward healed (5)
I believe the answer is:
cured
'healed' is the definition.
('cure' can be a synonym of 'heal')
'mangy hound edward' is the wordplay.
'mangy hound' becomes 'cur' (I've seen this in another clue. I am not sure about the 'mangy' bit.).
'edward' becomes 'Ed' (short for Edward).
'cur'+'ed'='CURED'
Can you help me to learn more?
(Other definitions for cured that I've seen before include "Preserved by drying, salting or smoking" , "Restored to health" , "Successfully treated" , "Healed or salted" , "Rehabilitated" .)