Traveller turns up — sometime later an artiste (9)
I believe the answer is:
performer
'an artiste' is the definition.
(I've seen this before)
'traveller turns up sometime later' is the wordplay.
'traveller' becomes 'rep' (travel company worker).
'turns up' is a reversal indicator.
'sometime' becomes 'former' (synonyms).
'later' says to put letters next to each other.
'rep' reversed gives 'per'.
'per'+'former'='PERFORMER'
(Other definitions for performer that I've seen before include "player" , "star?" , "Thespian" , "Fred Astaire, say" , "clown possibly" .)