Essex porter in new train (6,7)
I believe the answer is:
orient express
'train' is the definition.
(the Orient Express is a train service)
'essex porter in new' is the wordplay.
'new' indicates anagramming the letters.
'essex'+'porter'+'in'='essexporterin'
'essexporterin' anagrammed gives 'ORIENT EXPRESS'.
(Other definitions for orient express that I've seen before include "Luxury passenger train service, started in 1883, originally from Paris to Constantinople" , "Famous luxury train" , "Famous railway train" , "Paris-Istanbul train" .)