One can rave about eastern traveller (9)
I believe the answer is:
itinerant
'traveller' is the definition.
(itinerant is a kind of traveller)
'one can rave about eastern' is the wordplay.
'one' becomes 'i' (Roman numeral).
'can' becomes 'tin' ('tin' can be a synonym of 'can').
'rave' becomes 'rant' ('rant' can be a synonym of 'rave').
'about' says to put letters next to each other.
'eastern' becomes 'e'.
'rant' after 'e' is 'erant'.
'i'+'tin'+'erant'='ITINERANT'
(Other definitions for itinerant that I've seen before include "Wanderer" , "Rambling" , "(Person) on the move" , "Person who moves from place to place" , "Travelling from place to place" .)