Journey to the east? Nonsense! (5)
I believe the answer is:
tripe
'nonsense' is the definition.
(informal term for nonsense or false information)
'journey to the east?' is the wordplay.
'journey' becomes 'trip' (trip is a kind of journey).
'to the east?' becomes 'E' (abbreviation).
'trip'+'e'='TRIPE'
(Other definitions for tripe that I've seen before include "Balderdash" , "Rubbish, nonsense" , "which a freegan might eat?" , "Pants" , "Rot" .)