Answer:

dun

AnswerCrossword Clue
DUNBrownish-gray
DUNPressure over a debt
DUNGrayish-brown
DUNHorse hue
DUNBug about bills
DUNBug for payment
DUNGrayish brown
DUNGrayish shade
DUNPester for payment
DUNDull shade
DUNHorse color
DUNHound for bucks?
DUNPress for payment
DUNDull-colored
DUNDemand payment
DUNMake demands of
DUNHorse's hue
DUNDull brown
DUNGloomy
DUNHorse of a different color
DUNDark horse