Charged item to teetotal brother's room (3,4)
I believe the answer is:
dry cell
'charged item' is the definition.
'teetotal brother's room' is the wordplay.
'teetotal' becomes 'dry' ('dry' can be a synonym of 'teetotal').
'brother's room' becomes 'cell' (room inhabited by a monk).
'dry'+'cell'='DRY-CELL'
'to' acts as a link.
(Other definitions for dry cell that I've seen before include "Kind of battery used in smaller domestic appliances" , "Healthy accommodation for a prisoner" , "Type of battery" , "Source of power" , "Source of energy" .)