Charge back to bed with it (5)
I believe the answer is:
debit
'charge' is the definition.
(debit is a kind of charge)
'back to bed with it' is the wordplay.
'back' shows that the letters should be reversed in order.
'to' becomes 'ti' (I am not sure about this - if you are sure you should believe this answer much more).
'with it' means one lot of letters go next to another.
'ti'+'bed'='tibed'
'tibed' in reverse letter order is 'DEBIT'.
Can you help me to learn more?
(Other definitions for debit that I've seen before include "Sum taken from account" , "Charge" , "left-side entry" , "Payment made or owed" , "Accounting entry showing sums owing" .)