Maiden possibly facing accusation as cheat (10)
I believe the answer is:
Here is my best explanation:
'cheat' is the definition.
(overcharging is a kind of cheating)
'maiden possibly facing accusation' is the subsidiary indication.
'maiden possibly' becomes 'over' (maiden is a kind of over).
'facing' means one lot of letters go next to another.
'accusation' becomes 'charge' (I've seen this before**).
'as' is the link.
(Other definitions for overcharge that I've seen before include "rook", "Do", "Ask too high a price", "rip off", "Demand too high a price", "Demand too much money", "Rook", "Rip off", "leave phone plugged in unduly long!" and "Ask too much".)