The same part of depot tidied up (5)
I believe the answer is:
ditto
'the same' is the definition.
(ditto means the same as previously mentioned)
'part of depot tidied up' is the wordplay.
'part of' indicates the answer is hidden within the clue.
'up' says the letters should be written backwards (in down clue: letters go upwards).
'ottid' is hidden in the letters of 'depot tidied'.
'ottid' in reverse letter order is 'DITTO'.
(Other definitions for ditto that I've seen before include "Two dots indicating the same again" , "Mark used to indicate the word above it should be repeated" , "Copy" , "Dot it for the same again" , "that which has been said" .)