Her journey ends on the platform (5)
I believe the answer is:
daisy
'her' is the definition.
'journey ends on the platform' is the wordplay.
'ends' suggests the final letters.
'on' is a charade indicator (letters next to each other).
'the platform' becomes 'dais' (dais is a kind of platform).
The last letter of 'journey' is 'y'.
'y' after 'dais' is 'DAISY'.
(Other definitions for daisy that I've seen before include "Old song: '. . . . ., . . . . . give me your answer, do'" , "Flower of lawn and meadow" , "See 1 Across" , "Common wild flower" , "Composite" .)