Bilk

22 clues
Con
Gyp
Rook
Cheat
Sting
Cozen
Chisel
Fleece
Take in
Swindle
Rip off
Defraud
Flimflam
Bamboozle
Cheat (out of)
Put one over on
Take for a ride
Cheat out of money
Pull a fast one on
Rip off financially
Take to the cleaners
Take to the cleaners, so to speak