Alternative to road on the rise? One's given false account (4)
I believe the answer is:
liar
'one's given false account' is the definition.
(a liar gives a false story)
'alternative to road on the rise?' is the wordplay.
'alternative to road' becomes 'rail' (rail is an alternative to travelling by road).
'on the rise?' says the letters should be written backwards (in a down clue, letters go up).
'rail' written backwards gives 'LIAR'.
(Other definitions for liar that I've seen before include "Fabricator" , "not straight [one]" , "One telling untruths" , "one trying to sell pork pies" , "Tale-teller" .)