Train station (5)
I believe the answer is:
'train station' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for depot that I've seen before include "Place where buses and trains are kept" , "Place for storing or despatching goods" , "Depository for goods" , "Storehouse as for supplies" , "Toped (anag.)" .)