Drank too much in station, keeling over (5)
I believe the answer is:
toped
'drank too much' is the definition.
(I've seen this in another clue)
'station keeling over' is the wordplay.
'station' becomes 'depot' (depot is a kind of station).
'keeling over' shows that the letters should be reversed in order (in a down clue, words go up).
'depot' back-to-front is 'TOPED'.
'in' is the link.
(Other definitions for toped that I've seen before include "Drunk" , "went on a binge?" , "had lots of booze" , "fond of the booze?" , "Had lots of drinks" .)