In which to keep everything as it is?
I believe the answer is:
holdall
'in which to keep everything as it is?' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'in which to keep' is the wordplay.
'in which' becomes 'all' (I can't explain this - if you can you should give a lot more credence to this answer).
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'keep' becomes 'hold' (both can mean to have or possess something).
'all' put after 'hold' is 'HOLDALL'.
Can you help me to learn more?
(Other definitions for holdall that I've seen before include "Large bag (no need for another?)" , "Handled bag" , "Bag (contents unlimited?)" , "retainer" , "Item of luggage" .)