Fellow turned real wild (5)
I believe the answer is:
feral
'wild' is the definition.
(similar in meaning)
'fellow turned real' is the wordplay.
'fellow' becomes 'f' (abbreviation - of a society etc.).
'turned' is an anagram indicator.
'real' with letters rearranged gives 'eral'.
'f'+'eral'='FERAL'
(Other definitions for feral that I've seen before include "Wild, untamed" , "Wild but formerly tame" , "Flare up, going wild" , "Wild or brutal" , "Of plants or animals, wild" .)