Turned on wild wanderer (5)
I believe the answer is:
nomad
'wanderer' is the definition.
(I've seen this before)
'turned on wild' is the wordplay.
'turned' says the letters should be written backwards.
'wild' becomes 'mad' ('mad' can be similar in meaning to 'wild').
'on' written backwards gives 'no'.
'no'+'mad'='NOMAD'
(Other definitions for nomad that I've seen before include "Wanderer" , "someone who can't settle" , "A wandering tribesman" , "Itinerant" , "Roving person" .)