Hollywood actor turns wanderer (5)
I believe the answer is:
'wanderer' is the definition.
(nomad is a kind of wanderer)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for nomad that I've seen before include "Unsettled type", "Traveller with no permanent home", "Damon (anag.)", "wandering type", "one must move on".)