Track fibber on the way back (4)
I believe the answer is:
rail
'track' is the definition.
('rail' can be a synonym of 'track')
'fibber on the way back' is the wordplay.
'fibber' becomes 'liar' (I've seen this before).
'on the way back' says the letters should be written in reverse.
'liar' backwards is 'RAIL'.
(Other definitions for rail that I've seen before include "Bird with long legs" , "Supported bar - inveigh" , "method of transport" , "wader" , "Form of transport" .)