Answer: allowable

AnswerCrossword Clue
ALLOWABLENot improper.
ALLOWABLELegitimate
ALLOWABLEO.K.
ALLOWABLEKosher
ALLOWABLENot banned
allowablethat can be allowed / something allowed
allowableAllowed, esp. within a set of regulations; permissible
allowable(of an amount of money) Not considered as income for tax purposes