Nomad (8)
I believe the answer is:
wanderer
'nomad' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for wanderer that I've seen before include "Vagabond, rover" , "Nomad" , "Errand we run for rover" , "Errand we entrust to one who roams" , "Rambler, roamer" .)