Long arduous journey ends tonight for me, OK? (4)
I believe the answer is:
trek
'long arduous journey' is the definition.
(I've seen this before)
'ends tonight for me ok?' is the wordplay.
'ends' says to take the final letters.
The final letters of 'tonight for me ok' are 'TREK'.
(Other definitions for trek that I've seen before include "Expedition or difficult trip" , "Footslog" , "Long and difficult journey" , "Extended journey" , "Long hike" .)