Nonconformist male is in good health (6)
I believe the answer is:
misfit
'nonconformist' is the definition.
(I have seen 'A nonconformist' mean 'misfit' so perhaps 'nonconformist' could also mean 'misfit')
'male is in good health' is the wordplay.
'male' becomes 'm' (common abbreviation).
'in good health' becomes 'fit' (I've seen this before).
'm'+'is'+'fit'='MISFIT'
(Other definitions for misfit that I've seen before include "One who is out of place" , "Person not well suited to life or environment" , "not a suitable one" , "Square peg in a round hole" , "Person who cannot integrate into society" .)