No crazy wanderer (5)
I believe the answer is:
nomad
'wanderer' is the definition.
(I know that Nomad is a type of wanderer)
'no crazy' is the wordplay.
'crazy' becomes 'mad' (synonyms).
'no'+'mad'='NOMAD'
(Other definitions for nomad that I've seen before include "Person wandering" , "A member of a wandering tribe" , "Itinerant" , "Migrant" , "A wandering tribesman" .)