The wanderer Damon turns up (5)
I believe the answer is:
nomad
'the wanderer' is the definition.
(nomad is a kind of wanderer)
'damon turns up' is the wordplay.
'turns up' says the letters should be written backwards.
'damon' backwards is 'NOMAD'.
(Other definitions for nomad that I've seen before include "Damon (anag.)" , "Migrant" , "Roamer" , "Wanderer" , "one of those with no fixed home" .)