Not an insane wanderer (5)
I believe the answer is:
nomad
'wanderer' is the definition.
(I know that Nomad is a type of wanderer)
'not an insane' is the wordplay.
'not' becomes 'no' (negative).
'an insane' becomes 'mad' (I've seen this in another clue).
'no'+'mad'='NOMAD'
(Other definitions for nomad that I've seen before include "Wanderer" , "Itinerant" , "A wandering tribesman" , "one of those with no fixed home" , "Unsettled character" .)