At end of journey posh fellow escaped (3,3)
I believe the answer is:
got off
'escaped' is the definition.
('get off' can be a synonym of 'escape')
'at end of journey posh fellow' is the wordplay.
'at end of' means one lot of letters go next to another.
'journey' becomes 'go' (I've seen this in other clues).
'posh fellow' becomes 'toff' (I can't justify this - if you can you should believe this answer much more).
'go'+'toff' is 'GOT OFF'.
Can you help me to learn more?
(Other definitions for got off that I've seen before include "escaped punishment" , "fell asleep" , "went to sleep" .)