Journey east for rhubarb (5)
I believe the answer is:
tripe
'rhubarb' is the definition.
(I've seen this before)
'journey east' is the wordplay.
'journey' becomes 'trip' (trip is a kind of journey).
'east' becomes 'e' (abbreviation).
'trip'+'e'='TRIPE'
'for' acts as a link.
(Other definitions for tripe that I've seen before include "Rot" , "Balderdash" , "Stomach for consumption; nonsense" , "Edible lining of cow's stomach - rubbish" , "load of rubbish?" .)