B₃A₁C₃K₅R₁O₁O₁M₃

18 points

BACKROOM is validvalid

a place for meeting inconspicuously [n BACKROOMS]

58,909 of 196,601 in NWL2023·also valid in CSW24

a room at the back [n -S] / behind-the-scenes [adj]

16,790 of 280,887 in CSW24·also valid in NWL2023