No bananas for wanderer (5)
I believe the answer is:
nomad
'wanderer' is the definition.
(nomad is a kind of wanderer)
'no bananas' is the wordplay.
'bananas' becomes 'mad' (slang for insane).
'no'+'mad'='NOMAD'
'for' acts as a link.
(Other definitions for nomad that I've seen before include "being domestically unstable" , "Person wandering" , "one must move on" , "A member of a wandering tribe" , "Itinerant" .)