Healthy, strong (5)
I believe the answer is:
lusty
This clue is a double definition.
'healthy' is the first definition.
(similar in meaning)
'strong' is the second definition.
(I've seen this before)
(Other definitions for lusty that I've seen before include "Full of strength and energy" , "Brawny" , "Consumed with carnal desire" , "Full of health, vigour" , "Healthy, strong, vigorous" .)