Daily, for example, reversal of cost (6)
I believe the answer is:
charge
'cost' is the definition.
(I know that charge is a type of cost)
'daily for example reversal' is the wordplay.
'daily' becomes 'char' (both can mean a cleaner).
'for example' becomes 'e.g.' (short for 'exempli gratia', 'for example' in Latin).
'reversal' shows that the letters should be reversed in order.
'eg' reversed gives 'ge'.
'char'+'ge'='CHARGE'
'of' is the link.
(Other definitions for charge that I've seen before include "Formally accuse; rush" , "Ask for" , "Price for a service" , "Deliver an official injunction" , "Accuse or rush forward" .)