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American actor, Matt, becomes a drifter (5)

Ross

I believe the answer is:

nomad

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'drifter' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

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(Other definitions for nomad that I've seen before include "one of those with no fixed home" , "Unsettled character" , "Member of a wandering pastoral community" , "wandering type" , "Unsettled type" .)

I've seen this clue in The Guardian.
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