Tidy number originally put away (6)
I believe the answer is:
neaten
'tidy' is the definition.
(I know that tidy can be written as neaten)
'number originally put away' is the wordplay.
'originally' indicates taking the first letters.
'put away' becomes 'eaten' (I've seen this in another clue).
The first letter of 'number' is 'n'.
'n'+'eaten'='NEATEN'
(Other definitions for neaten that I've seen before include "Trim" , "Groom" , "Spruce up" , "Make orderly" , "Straighten up" .)